odd cache behavior with memcached

[levity]

code sample: http://dpaste.com/114571/

that code runs on every request to a certain page, which is being hit
frequently. there are only 10 unique keys, and each of them gets
requested several times within the 5-minute window of cache
expiration.

however, what seems to happen is that things are cached correctly for
the first few minutes of restarting apache, but after that point,
there are far more misses than there should be. there should be only 1
miss for each of the 10 keys in each 5-minute period, but instead it's
90% misses.

apache, mod_python, memcached, ubuntu. i'm really puzzled as to what
this could be.

here's my memcached.conf for good measure. the only non-default is
that i've increated the RAM to 128M.

thanks in advance for any help you can offer! --lawrence


# memcached default config file
# 2003 - Jay Bonci 
# This configuration file is read by the start-memcached script
provided as
# part of the Debian GNU/Linux distribution.

# Run memcached as a daemon. This command is implied, and is not
needed for the
# daemon to run. See the README.Debian that comes with this package
for more
# information.
-d

# Log memcached's output to /var/log/memcached
logfile /var/log/memcached.log

# Be verbose
# -v

# Be even more verbose (print client commands as well)
# -vv

# Start with a cap of 64 megs of memory. It's reasonable, and the
daemon default
# Note that the daemon will grow to this size, but does not start out
holding this much
# memory
-m 128

# Default connection port is 11211
-p 11211

# Run the daemon as root. The start-memcached will default to running
as root if no
# -u command is present in this config file
-u nobody

# Specify which IP address to listen on. The default is to listen on
all IP addresses
# This parameter is one of the only security measures that memcached
has, so make sure
# it's listening on a firewalled interface.
-l 127.0.0.1

# Limit the number of simultaneous incoming connections. The daemon
default is 1024
# -c 1024

# Lock down all paged memory. Consult with the README and homepage
before you do this
# -k

# Return error when memory is exhausted (rather than removing items)
# -M

# Maximize core file limit
# -r

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Re: Model for newbie

[DragonSlayre]

I'm guessing that you might have tried to do a ForeignKey(User) for
the other_invited.  If that is the case, then I think you need to add
a related_name e.g. ForeignKey(User,
related_name="group_invited_to").  You may have to do a related name
for the creator as well.

I hope that helps.

On Jan 30, 8:16 pm, Kirill  wrote:
> Hello all!
>
> I have some logic problem I really don't understand how make model
> for this task:
>
> I have registered users (i want to use User class).
> Each registered user can create project (or group or blog) where he
> can invite another users
> So, how it's better to do model ?
>
> #
>
> from django.cotrib.auth.models import User
>
> class Project_or_Group_or_Blog(models.Model):
>         creator = models.ForeignKey(User)           # many users for
> one project. How it's will be written in table ?
>         other_invited = models. ? (User) # Here should be many
> ids: first_id, second_id etc.
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Re: Performance using session, passing data from one request to another, use js or not? Best practice?

[Thomas Guettler]

Tim Daniel schrieb:
> Thanks for the answer, I was already getting worried about my
> 'session' way. No caching for know although it doesn't seem difficult
> to implement. And yes the way you do it would have that advantage, but
> mine has beautiful urls!! ^^
> thanks again,
>
>   
URLs are beautiful if they don't change (you can bookmark them) or send
as them link.

Sessions get deleted sooner or later.

 Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


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Model for newbie

[Kirill]

Hello all!

I have some logic problem I really don't understand how make model
for this task:

I have registered users (i want to use User class).
Each registered user can create project (or group or blog) where he
can invite another users
So, how it's better to do model ?



#

from django.cotrib.auth.models import User

class Project_or_Group_or_Blog(models.Model):
creator = models.ForeignKey(User)   # many users for
one project. How it's will be written in table ?
other_invited = models. ? (User) # Here should be many
ids: first_id, second_id etc.



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Re: charts in django

[Jeff Hammerbacher]

I've employed flot (http://code.google.com/p/flot/) with some success. It's
pure javascript and requires jquery.

On Thu, Jan 29, 2009 at 7:39 PM, Nick Lo wrote:

>
> > I need to generate some line charts and bar graphs from django. I
> > recall seeing a very promissing package a couple months ago and can't
> > find it now.
> >
> > There's pychart, but it hasn't been maintained for a couple years and
> > I question its staying power, and it just generates images. open-
> > flash-
> > chart has a python binding, but its documentation is very sketchy and
> > I don't know how good its support is. visifire looks like it has a
> > great future, but depends on silverlight which is not widely deployed
> > yet.
> >
> > Any other ideas or comments on the above?
>
> I was using Open Flash Chart in a PHP project which is now a Python/
> Django one. This was before its more developed Python API, but it was
> quite straightforward to use under both languages. Unfortunately it
> lacked some of the charts we needed so we switched to XML/SWF charts
> with minidom:
>
> http://code.google.com/p/open-flash-chart-python/
> http://www.maani.us/xml_charts/
>
> Nick
>
>
> >
>

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Snippets app ?

[Nicolas Steinmetz]

Hi djangonauts,

For my site, I planned to include a snippets app and was thinking about 
cab [1] which powers djangosnippets or some other snippets app.

For Cab, it looks it's not updated since April 2007 so I think it's not 
compatible with Django 1.0.x or do not take benefit from 1.0.x features 
and improvements.

The code of snipt.net is no longer available on Google Code too. I found 
some pastebin app (like Spaste) but I wish more a snippets repository 
than a pastebin.

Do someone know some snippets app available somewhere ?

Regards,
Nicolas

[1] http://code.google.com/p/cab/


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Validating and rendering dynamic form

[DragonSlayre]

I've created a dynamic form to allow users to upload images, and I'm
trying to validate the form.  - it displays fine, but when I validate
and return a response, I get either a Key Error at the line (data =
self.cleaned_data[dataName] ) in _clean_photo or I get a render error
in my template at {{ image_form.as_table }} - I'm not too sure why
sometimes I get either of the errors.

In my view that gets posted to, i have:
  #images_submitted is a list of the names of the  submitted image
fields
  listingImages = make_image_form(images_submitted)
  image_form = listingImages(request.POST, request.FILES)

The code calls into the make_image_form  view to create the form:

def _clean_photo(self, dataName):
data = self.cleaned_data[dataName]
if data != None:
if data.size > max_photo_size:
raise forms.ValidationError("The maximum image size
allowed is 500KB")
elif data.size == 0:
raise forms.ValidationError("The image given is
empty.")
return data

def make_image_form(image_fields):
''' Takes a list of image_fields to generate image fields '''
images = SortedDict()  #a django sortedDict
#create the ImageFields for the form
for image_name in image_fields:
images[image_name] = forms.ImageField(required=False)
new_form = type('ListingImagesForm2', (forms.BaseForm,),
{'base_fields' : images})
#now we add the validation methods to the class
for image_name in image_fields:
setattr(new_form, 'clean_' + image_name, lambda self:
self._clean_photo(image_name))
#Add the _clean_photo method to the class
setattr(new_form, '_clean_photo', _clean_photo)
return new_form



The _clean_photo method only gets called once -  for the first photo.
The ListingImagesForm2 class gets created fine, and the clean_photo_1,
2, 3 methods get created fine as well.

I'm not too sure what's happening with the errors, but I think that it
must have something to do with how I'm validating.  When _clean_photo
was called,  self.cleaned_data had the image info for the first image
only, when 2 or 3 images were posted.

I hope I've provided enough information for help, any ideas as to what
might be wrong will be highly appreciated :)
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Re: error when using delete generic views

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 21:31 -0800, vierda wrote:
> Dear all,
> Thanks for your reply I have modified my code as per below :
> 
> views.py :
[...]
> def delete (request):
>user = request.user
>if user.is_superuser:
>   if request.method == 'POST':
>  form = DeleteForm(request.POST)
>  if form.is_valid:
> username = form.cleaned_data['username']
> user_delete = User.objects.get(username=username)
> id_delete = user_delete.id
> return delete_object(request,object_id = id_delete,
> model=User, post_delete_redirect='/notify/success/',
> template_name='delete.html',login_required=True)
>   else :
>  form = DeleteForm()
>   variables = RequestContext(request, {'form' : form})
>   return render_to_response('delete.html',variables)

[...]
> the display_delete_profile run fine and exactly like I want, but
> delete always raise error "The view
> fintoo.apps.authorization.views.delete didn't return an HttpResponse
> object."
> I have google it and by example provided it relate to indentation
> matters when put template renderer. but I think I don't have any
> problem with that. please put some light and really appreciate for any
> kind help. Thank you.

It is kind of an indentation thing. Basically, every possible way of
leaving the view function has to return an HttpResponse (which is what
render_to_response() returns).

Have a look at your view and notice what happens when user.is_superuser
is False. The code falls off the bottom of the function, which
implicitly returns None. You need to return something in that situation
as well.

Regards,
Malcolm



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Re: How to pass the variable which is defined in the views.py to the jQuery function

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 21:11 -0800, min wrote:
> Hi.
> 
> First, the code in the forms.py:
> 
> class TestForm(forms.Form):
> name = forms.CharField( max_length=30 )
> 
> Then, the variable is defined in the views.py:
> 
> def Test_page(request):
> form = TestForm()
> show_results = False
> variable = ''
> if request.GET.has_key('name'):
> show_results = True
> query = request.GET['name'].strip()
> variable  = 'custom value'
> variables = RequestContext(request, {
> 'form': form,
> 'show_results': show_results,
> 'variable': variable
>  })
> return render_to_response('Test.html', variables)
> 
> I know the value of variable can be accessed by using {{variable}} in
> the Test.html. However, if I want use the jQuery in the Test.html and
> pass the value of this variable to the jQuery function, how to do
> that?
> 
> I have tried: var x = $("variable").val(), and not succeed.

The context dictionary you pass to render_to_response is used by
render_to_response to produce a string. That string is what is sent back
to the browsers. The variables (parameters, whatever we want to call
them) are shoved into the template -- in a nice way; they're made very
comfortable -- and become static data in the final result. That is, they
are *not* variables from the browser's perspective. Template rendering
happens fully on the server side.

If you want to access this data via Javascript, you first have to make
it available as a Javascript variable in the template. For example, you
could write this in your template (inside a script block).

var x = "{{ variable|escape_js }}";

The {{...}} bit is converted to a string by the (server-side) template
rendering. Then "x" is available to the browser-side Javascript. Clear
as mud?

Regards,
Malcolm



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Re: error when using delete generic views

[vierda]

Dear all,
Thanks for your reply I have modified my code as per below :

views.py :
def display_delete_profile(request):
   user = request.user
   if user.is_superuser:
  user_list = User.objects.all()
  return render_to_response ('delete.html',
{'user_list':user_list})

def delete (request):
   user = request.user
   if user.is_superuser:
  if request.method == 'POST':
 form = DeleteForm(request.POST)
 if form.is_valid:
username = form.cleaned_data['username']
user_delete = User.objects.get(username=username)
id_delete = user_delete.id
return delete_object(request,object_id = id_delete,
model=User, post_delete_redirect='/notify/success/',
template_name='delete.html',login_required=True)
  else :
 form = DeleteForm()
  variables = RequestContext(request, {'form' : form})
  return render_to_response('delete.html',variables)

forms.py:
class DeleteForm(ModelForm):
   class Meta :
  model = User
  fields = ('username',)

template:
 Delete User 

 Please select username below for delete profile 


 username : 
 Please select as the default item in the
list
   {% for user in user_list %}
  {{ user.username }} 
   {% endfor %}
   




the display_delete_profile run fine and exactly like I want, but
delete always raise error "The view
fintoo.apps.authorization.views.delete didn't return an HttpResponse
object."
I have google it and by example provided it relate to indentation
matters when put template renderer. but I think I don't have any
problem with that. please put some light and really appreciate for any
kind help. Thank you.

regards,
-vierda-


On Jan 29, 5:41 pm, Malcolm Tredinnick 
wrote:
> On Wed, 2009-01-28 at 23:47 -0800, Daniel Roseman wrote:
>
> [...]
>
> > No, you have provided four keyword arguments. The signature for the
> > delete_object function is as follows:
> > def delete_object(request, model, post_delete_redirect,
> > object_id=None,
> >         slug=None, slug_field='slug', template_name=None,
> >         template_loader=loader, extra_context=None,
> > login_required=False,
> >         context_processors=None, template_object_name='object'):
>
> > So you need to pass request, model and post_delete_redirect *without*
> > keywords, as simple positional arguments:
> > return delete_object(request, User, '/notify/delete_done/',
> > template_name='delete.html', login_required=True)
>
> Everything you've written is correct, except for this bit. You
> emphasised the word "without" and that's not necessary. If a Python
> function has this signature:
>
>         def foo(a, b, c=None, d=6):
>            ...
>
> then you can quite happily use keyword arguments for the 'a' and 'b'
> parameters. What is different about those parameters is that you *must*
> supply them. They don't have default values. So foo(c=6, a=1, b='fred')
> would be a valid way to call that function.
>
> The Python error message is slightly misleading here (and it is
> generated by Python, not by Django). What they mean is that it takes two
> required arguments. By definition (Python's syntax requires it), the
> required arguments have to come before any default arguments, so they
> can be passed in as positional arguments. But the keyword/non-keyword
> argument distinction is actually a bit misleading in this case.
>
> Regards,
> Malcolm
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Re: building a blog site

[jazz]

Hi Muslu

how can i can it yuor website to english. I dont uderstad that
language.

On Jan 19, 11:20 pm, "Muslu Yüksektepe" 
wrote:
> i am preparing a blog site.
> check outwww.yuksektepe.com
> i will add how can make blog as soon as
> thank you
> from Turkiye
>
> 2009/1/19 joti chand 
>
>
>
> > anyone knows is there any blog site development example in django
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How to pass the variable which is defined in the views.py to the jQuery function

[min]

Hi.

First, the code in the forms.py:

class TestForm(forms.Form):
name = forms.CharField( max_length=30 )

Then, the variable is defined in the views.py:

def Test_page(request):
form = TestForm()
show_results = False
variable = ''
if request.GET.has_key('name'):
show_results = True
query = request.GET['name'].strip()
variable  = 'custom value'
variables = RequestContext(request, {
'form': form,
'show_results': show_results,
'variable': variable
 })
return render_to_response('Test.html', variables)

I know the value of variable can be accessed by using {{variable}} in
the Test.html. However, if I want use the jQuery in the Test.html and
pass the value of this variable to the jQuery function, how to do
that?

I have tried: var x = $("variable").val(), and not succeed.
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Re: Finding and Displaying the Object that a Comment is Created On

[dave.mer...@gmail.com]

Thanks SO much. That did the trick.

Dave

On Jan 29, 1:28 pm, "alex.gay...@gmail.com" 
wrote:
> On Jan 29, 3:48 pm, "dave.mer...@gmail.com" 
> wrote:
>
> > This si a somewhat nooby question.
>
> > I have a comment. I want to display the post title for the
> > comment.object_id.
>
> > In the template I have been trying things like comment.post.title, but
> > that is not working.
>
> > I think it is due to the fact that Comments use a generic foreign key.
> > So... how do I do this?
>
> > Any references?
>
> > Lemme know.
> > Dave
>
> comment.content_object.title
> should get what you want
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Re: Unique_together across classes

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 19:54 -0800, CALdan wrote:
> hi!
> 
> I'm putting together a simple model in Django as an example for a
> large project.  I'm attempting to set up the models in an efficient
> manner with as little redundancy as possible (none).
> 
> What I'm attempting to do is use unique_together across 2 classes
> which are linked through their primary key fields, with the
> unique_together referencing a field from each table which are not the
> primary keys.
> 
> Is it possible to use unique_together across classes like this?  If
> not, what alternative could I use that's clean and efficient?

You can't add the lines -> survey unique constraint through Django's
ORM. The Meta.unique_together attribute is only for adding a constraint
to fields on the table for that model. You're needing a more complex
check constraint at the database level and this isn't supported. You
could add it as a table modification using raw SQL (via, say, the
post-syncdb hook, or just manually), but it won't be handled by things
like form validation, so will be a little tricky to work with.

One workaround is to wait a little bit until model-aware validation
lands and add model-level validation as well, to the Lines model, to do
this checking. That wouldn't completely remove the possibility of an
IntegrityError when you save to the databse, but no uniqueness checks at
the Python level can do that (it can be unique when we validate and
something else can have written to the database before we save), but
it's a way of making it work more smoothly. By "smoothly" here, I'm
meaning having some way of detecting a potential clash before calling
save() and seeing an IntegrityError returned from the database.

> The rules that need to be adherred to within the model are as follows:
> 
> 1.Survey's have many Lots.
> 
> 2.Within a Survey, Lot numbers must be unique.
> 
> 3.Lot's have many Lines.
> 
> 4.Within a Survey, Line numbers must be unique.

> 
> The models are posted below with the fields in question in bold.
> 
> class Survey(models.Model):
> survey = models.IntegerField(primary_key=True,  unique = True)
> 
> class Meta:
> ordering = ["survey"]
> db_table='survey'
> 
> class Lot(models.Model):
> lot_id = models.AutoField(primary_key=True,  unique = True)
> lot_number = models.IntegerField()
> survey = models.ForeignKey(Survey, db_column ='survey')
> 
> class Meta:
> ordering = ["lot_number"]
> db_table='lot'
> unique_together = ("lot_number",  "survey")
> 
> class Line(models.Model):
> line_id = models.AutoField(primary_key=True,  unique = True)
> lot_id = models.ForeignKey(Lot, db_column='lot_id')

You should consider renaming the attribute here to just "lot" (or
something similarly descriptive; "lot" would require you to add a
related_name attribute).

The thing is, from a Python perspective, that attribute does *not* hold
the lot_id. It actually contains a Lot instance whenever you're using.
It's a Lot, not an id. There will be a "hidden" attribute generated on
the model called (in your case) lot_id_id, which will be the actual
lot_id, but you never interact with that. Code that uses "lot_id", when
it really means "lot instance" tends to be confusing to read in six
months time (it's a common first stab at naming and I've seen it enough
in client code to want to warn people away from it).

Regards,
Malcolm


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Re: reason for missing readline() in uploaded files?

[Todd O'Bryan]

On Thu, Jan 29, 2009 at 9:28 PM, Malcolm Tredinnick
 wrote:
>
> On Thu, 2009-01-29 at 15:40 -0500, Todd O'Bryan wrote:
>> I'm trying to validate an uploaded csv file, so I want to read the
>> first line of text and if it's not the right format, send an error
>> message. Unfortunately, neither InMemoryUploadedFile nor
>> TemporaryUploadedFile have the readline() method.
>>
>> Was that an oversight (in which case I'll create a two-line patch and
>> submit it--both StringIO and temp files support the method) or a
>> design decision with a good reason?
>
> It's a flaw in Python: what an object needs to be "file-like" is not
> well defined. Different users require different things. A file doesn't
> really need a readlines() method, except when it does, etc.
>
> There's about half a dozen tickets open for "add X, Y or Z" to the file
> stuff, so look through those first.
>
> Regards,
> Malcolm
>

OK. I proxied every file-like object method or attribute listed in the
Python docs. If something doesn't work now it's because the object
that backs the UploadedFile doesn't support it, not because we forgot
to provide a proxy to it.

http://code.djangoproject.com/ticket/9404

Todd

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Unique_together across classes

[CALdan]

hi!

I'm putting together a simple model in Django as an example for a
large project.  I'm attempting to set up the models in an efficient
manner with as little redundancy as possible (none).

What I'm attempting to do is use unique_together across 2 classes
which are linked through their primary key fields, with the
unique_together referencing a field from each table which are not the
primary keys.

Is it possible to use unique_together across classes like this?  If
not, what alternative could I use that's clean and efficient?

The rules that need to be adherred to within the model are as follows:

1.Survey's have many Lots.

2.Within a Survey, Lot numbers must be unique.

3.Lot's have many Lines.

4.Within a Survey, Line numbers must be unique.

The models are posted below with the fields in question in bold.

class Survey(models.Model):
survey = models.IntegerField(primary_key=True,  unique = True)

class Meta:
ordering = ["survey"]
db_table='survey'

class Lot(models.Model):
lot_id = models.AutoField(primary_key=True,  unique = True)
lot_number = models.IntegerField()
survey = models.ForeignKey(Survey, db_column ='survey')

class Meta:
ordering = ["lot_number"]
db_table='lot'
unique_together = ("lot_number",  "survey")

class Line(models.Model):
line_id = models.AutoField(primary_key=True,  unique = True)
lot_id = models.ForeignKey(Lot, db_column='lot_id')
line_number = models.IntegerField()

class Meta:
ordering = ["line_number"]
db_table='line'
unique_together =[("Lot.survey"), ("line_number")]

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Re: charts in django

[Nick Lo]

> I need to generate some line charts and bar graphs from django. I
> recall seeing a very promissing package a couple months ago and can't
> find it now.
>
> There's pychart, but it hasn't been maintained for a couple years and
> I question its staying power, and it just generates images. open- 
> flash-
> chart has a python binding, but its documentation is very sketchy and
> I don't know how good its support is. visifire looks like it has a
> great future, but depends on silverlight which is not widely deployed
> yet.
>
> Any other ideas or comments on the above?

I was using Open Flash Chart in a PHP project which is now a Python/ 
Django one. This was before its more developed Python API, but it was  
quite straightforward to use under both languages. Unfortunately it  
lacked some of the charts we needed so we switched to XML/SWF charts  
with minidom:

http://code.google.com/p/open-flash-chart-python/
http://www.maani.us/xml_charts/

Nick


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Re: Django Forms in HTML 4.01 Strict

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 15:18 +0100, Gertjan Klein wrote:
> Malcolm Tredinnick wrote:
> 
> >On Wed, 2009-01-28 at 14:33 +0100, Gertjan Klein wrote:
> >> Malcolm Tredinnick wrote:
> >> 
> >> I disagree. When I develop web pages (using Django or otherwise) I use
> >> the Firefox HTML validator extension. This helps me write
> >> standards-compliant HTML -- a big red cross indicates a problem in my
> >> page. It is annoying if that big red cross no longer indicates anything
> >> (there might be problems *I* caused, or it might just be Django stuff).
> >
> >You realise that you're effectively confirming what I said, right?. The
> >big red cross is a cosmetic issue. The fact that it makes precisely zero
> >difference to the practical matter of how a real-world web browser
> >processes the page means it's not fatal/tragic.
> 
> No, I think you may have misunderstood me. The XHTML slash is cosmetic;
> to my knowledge, all current browsers are capable of dealing with that
> (thus deviating from what the standard dictates them to do, but
> practicality beats purity, I guess ;)).

XHTML, being XML, is consumed by much more than just web browsers and
should be targeted at being correctly parsed and rejected by any
conforming XML library (feed readers being one example). Conformance to
the XML requirement that errors are fatal is therefore important. HTML
is sufficiently screwed up that it's not really possible to level that
requirement against it.

> However, *my* HTML (as opposed to Django's generated HTML) may contain
> errors as well, and regularly does. The big red cross in an invaluable
> indicator that I messed something up, and losing that functionality is
> annoying.

In other words, there is a slight, but annoying, problem with such
tools, in that they don't differentiate between errors that are going to
cause real problems and those which aren't. That happens to interact
with a slight, but annoying, problem in Django. No harm, no foul. Things
could be better on both sides and one day people might change them.

I'm completely in favour of 100% valid HTML code wherever possible. But
I'm more in favour of knowing why that isn't compulsory and not always
possible, and why there does need to be some differentiation.

>  Now, when using HTML as opposed to XHTML, I can no longer see
> if I did something wrong, as the page is *always* in error (from a
> standards compliance POV).
> 
> >Then you'll have no trouble creating a parallel set of form widgets or a
> >form framework that can handle this and everybody will be happy. :-)
> 
> No, I have no desire to do such a thing. As I stated before, the
> practical solution for me was to switch to XHTML.
> 
> >Or look at the django-html project on Google Code, where various ideas
> >are being tried out.
> 
> I did, briefly, and didn't like what I saw. They overcomplicate things,
> IMHO. I don't want DOCTYPE management, for example.

Which shows why it's a harder problem than it looks on the surface, once
you start looking at the details. Explains why it isn't in Django yet.

> >(you're certainly paid just as much to work on Django as me, for
> >example).
> 
> This payment thing comes up regularly here, and pollutes the discussion.
> I have been using Django for a while, and found it to have good things
> and downsides (both IMHO). I have not even critisized Django here (yet
> ;)), just expressed mild curiousity. I don't think I've given you reason
> to bring up that you're not payed for your work on Django.

Take it in the spirit it was offered, dude. Exactly the same tone as you
used. It was part of a broader explanation about why this
feature/enhancement isn't in Django and was only mentioned as part of a
sentence in the second or third response because you kept going on about
how the cosmetic thing was much more important to you. Let's keep some
perspective, please. I wasn't intending to cause offence. If you're
going to go on about something, I'm going to give you the full list of
reasons why the state of play is as it is and how it can be made better.
If you don't want the answer, don't ask the question.

> >Maintaining two copies of everything certainly adds to the workload.
> 
> I have not suggested such thing though. From a brief look at the source
> code, it appeared to me that it would be easy to create a setting that
> specifies whether to include the slash or not, and based on that setting
> write either " />" or ">" at the end of input tags (and ).

It's a question of which compromises should be made and where. You've
indicated you'd be happy without that, for others, it would still be a
hack if they don't have the DOCTYPE control (for the record, I have
precisely no opinion on that yet). That's the fun of working with this
stuff: never able to please everybody immediately.

I think we should probably move on now.

Regards,
Malcolm



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Re: passing self?

[ajlozier]

Hope out loud is really all i was trying to do also - I'm not
demanding a solution of you.  And please believe me when i say i am
very appreciative of your work on django personally.  I actually love
the framework and have been able to, rather quickly, throw together
vast portions of my envisioned project with little to no trouble.
However, as someone who has been developing for several years, i have
become accustomed to building interfaces that operate in a certain
way.  I really like using tree structures and for this project it is
very important to do so.  With each new framework I've learned, even
in PHP which I've been using for years - such as CakePHP or Zend with
Doctrine - one of my first "battles" with the framework how to
generate tree menus and inputs, whether it be something simple like an
indented select list (that's what I was trying to do in the
discussions above - my first question was more direct but no one
responded) -- or something like an expandable, animated tree which
interacts with javascript.  For me when I reach a point where I need
that, I can't move forward until I've figured out how to do it.  So I
wasn't really trying to modify how Django works at all - I was just
trying to accomplish one of a handful of specific functionalities I
would need for my projects.

While it may be simple to others, I am nonetheless proud of what I
came up with.  It felt really good to get it working, and understand
why it works: http://pastebin.com/f50991c2c

It relies upon django-mptt to work, which operates similarly to other
tree behavior packages I've used in the past.

I know everyone here is a volunteer.  I myself am not doing this
project for pay, but to benefit a larger community I am a part of.  I
don't ask anything of anyone that they do not have the time or energy
to give.  And if anything I've said has seem directed at you, I
certainly do not mean it.  As I said you have been very fair with me.
I think I am just needing to vent now that I have finally accomplished
this one simple task but had a few interactions that definitely made
it harder.

As for your suggestion to start a beginners django group - it is not
that I am opposed to that, but as I am only a beginner myself I am not
sure it would be very appropriate or effective.  As I myself could not
volunteer on that project in terms of answering beginner's questions,
it would seem a little presumptuous.  However, creating some sort of
forum geared towards beginners for a variety of languages/platforms -
now that might be something worth taking on at some point.


On Jan 29, 9:46 pm, Malcolm Tredinnick 
wrote:
> On Thu, 2009-01-29 at 15:47 -0800, ajlozier wrote:
> > Hi Malcolm,
>
> > I figured it out.  This article is what pointed me in the right
> > direction:
>
> >http://www.b-list.org/weblog/2008/nov/09/dynamic-forms/
>
> > While you are right that there are a lot of examples in the code of
> > something similar, and that, in theory, I should be able to find the
> > answer to any question by perusing the source code, it doesn't
> > necessarily work for beginners - especially beginners who don't have a
> > strong python background.  I am guessing django wants to attract all
> > kinds of developers, even those who are just starting to learn python,
> > am I right?  Or maybe not.
>
> We aim to support and welcome all people, but beginners aren't the
> primary audience. Partly because you're only a beginner at the start.
> Django's primary audience is something like  people or teams who are
> comfortable with Python, web tech (HTML, javascript, CSS, etc) up to the
> level they wish to employ it, and databases (this is where we are
> probably have the most shielding over ugly reality) and want something
> to make the routine stuff faster (that's a very rough précis). It's not
> too difficult to bootstrap from zero up to that level, but it's not
> something that happens overnight.
>
> Regarding Python, particularly, Django is designed to provide a Python
> interaction or Python-like interface to a bunch of stuff. So, yes, it
> absolutely requires familiarity with Python. Before embarking on using
> Django, preferably.
>
> As I've suggested a couple of times in this thread, whilst at the
> beginner level, you have to set goals that correspond: work with the fat
> part of the feature list, the 90% that are documented with English
> descriptions and example code. Wandering off into the other 10% from day
> one is possibly interesting and exciting, but not the route to rapid
> enlightenment -- and if you're willing to take the time, that's fine.
> Time/experience/goals form a trade-off triangle here.
>
> I certainly take the position that if somebody isn't comfortable with
> Python, then diving around customising Django is not the right place to
> be working. It takes a couple of days to a couple of weeks to get really
> comfortable with Python. Working through "Dive into Python" and the
> python tutorial and/or one 

Re: Any way to NOT escape a percent sign using 'contains'?

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 18:47 +, Adam Stein wrote:
> According to the docs, when using 'contains' in filter() a percent sign
> or underscore is automatically escaped.  However, in my case I want the
> resulting SQL to use the percent sign.
> 
> I know 'contains' will fill in the outside percent signs, but it escapes
> the percent sign in my string.  So that calling:
> 
>   Entry.objects.filter(headline__contains='a%b')
> 
> will result in:
> 
>   SELECT ... WHERE headline LIKE '%a\%b%';

Because the "contains" lookup type is used to look for string
containment, not as a proxy for SQL. We deliberately try to not leak the
underlying SQL abstraction (the storage backend may not even be SQL,
after all).

> 
> but I want it to be this instead:
> 
>   SELECT ... WHERE headline LIKE '%a%b%';
> 
> This there an easy way to do this?
> 
> I could use regexp, but I didn't want people to know that they would
> have to use "a.*b" instead of "a*b", just trying to make it simplier for
> myself and the people using the system.

Well, the regexp lookup type is for this purpose, so it's the right tool
to use at the code level. The point about the user-interface is well
taken, but it doesn't have to be a transparent pass-through. What I
would suggest is converting your value by doing using

value = value.replace('%', '.*')

at some point. If these values are coming in through a form field, a
custom cleaning method for the form field would be a nice level to this
at, for example.

Regards,
Malcolm



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Re: TINYMCE causing form error "This field is required."

[Eric I.E.]

Thanks for your help Daniel,
That was exactly my problem. I changed the ModelForm in admin.py to
this and it resolved the issue.

class EntryAdminForm(forms.ModelForm):
body_html = forms.CharField(widget=TinyMCE(attrs={'cols': 80, 'rows':
30}))
excerpt_html = forms.CharField(widget=TinyMCE(attrs={'cols': 80,
'rows': 30}), required=False)



On Jan 26, 3:55 am, Daniel Roseman 
wrote:
> On Jan 26, 5:22 am, "Eric I.E."  wrote:
>
>
>
> > When I addTinyMCEto my form fields it turns them from optional
> > (blank=True, null=True) into required fields.
> > I am using django-tinymcein conjunction with django-filebrowser.
>
> > My field is defined in models.py like this:
> > column1 = models.TextField(help_text="Extended Info", blank=True,
> > null=True)
>
> > and theTinyMCEeditor is applied in the admin.py
> > class NewsItemAdminForm(forms.ModelForm):
> > column1 = forms.CharField(widget=TinyMCE(attrs={'cols': 80, 'rows':
> > 25}))
>
> > Everthing performs as expected until saving when I receive an error
> > reading "This field is required."
> > RemovingTinyMCEremoves the error. Any ideas where to start with that
> > one?
>
> This is standard behaviour, not connected toTinyMCE. If you override
> any field in a modelform, you need to specify all the options -
> including whether it's a required field or not.
> --
> DR.
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Re: charts in django

[Tim Chase]

Chris Haynes wrote:
> I need to generate some line charts and bar graphs from django. I
> recall seeing a very promissing package a couple months ago and can't
> find it now.
[snip]
> Any other ideas or comments on the above?

Linux Journal's most recent print-edition had a good article 
introducing the Dojo toolkit, including for graphing.  I have a 
junior developer investigating this toolkit for some of our own 
in-house charting/graphing needs.

-tim




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Re: passing self?

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 15:47 -0800, ajlozier wrote:
> Hi Malcolm,
> 
> I figured it out.  This article is what pointed me in the right
> direction:
> 
> http://www.b-list.org/weblog/2008/nov/09/dynamic-forms/
> 
> While you are right that there are a lot of examples in the code of
> something similar, and that, in theory, I should be able to find the
> answer to any question by perusing the source code, it doesn't
> necessarily work for beginners - especially beginners who don't have a
> strong python background.  I am guessing django wants to attract all
> kinds of developers, even those who are just starting to learn python,
> am I right?  Or maybe not.

We aim to support and welcome all people, but beginners aren't the
primary audience. Partly because you're only a beginner at the start.
Django's primary audience is something like  people or teams who are
comfortable with Python, web tech (HTML, javascript, CSS, etc) up to the
level they wish to employ it, and databases (this is where we are
probably have the most shielding over ugly reality) and want something
to make the routine stuff faster (that's a very rough précis). It's not
too difficult to bootstrap from zero up to that level, but it's not
something that happens overnight.

Regarding Python, particularly, Django is designed to provide a Python
interaction or Python-like interface to a bunch of stuff. So, yes, it
absolutely requires familiarity with Python. Before embarking on using
Django, preferably.

As I've suggested a couple of times in this thread, whilst at the
beginner level, you have to set goals that correspond: work with the fat
part of the feature list, the 90% that are documented with English
descriptions and example code. Wandering off into the other 10% from day
one is possibly interesting and exciting, but not the route to rapid
enlightenment -- and if you're willing to take the time, that's fine.
Time/experience/goals form a trade-off triangle here.

I certainly take the position that if somebody isn't comfortable with
Python, then diving around customising Django is not the right place to
be working. It takes a couple of days to a couple of weeks to get really
comfortable with Python. Working through "Dive into Python" and the
python tutorial and/or one of any number of other online and paper-based
resources. Taking that time to save effort and stress later on is surely
worth it.

> 
> I'd just like to make one observation.  On every page of the django
> introductory tutorial there is the following at the bottom:
> 
> Questions/Feedback
> 
> Having trouble? We'd like to help!
> 
> * Try the FAQ — it's got answers to many common questions.
> * Search for information in the archives of the django-users
> mailing list, or post a question.
> * Ask a question in the #django IRC channel, or search the IRC
> logs to see if its been asked before.
> 
> It sounds so welcoming, but the reality for us beginners is not so
> rosy.  I went in this exact order.  Searched the documentation.
> Couldn't figure it out.  Posted a question in the user group - first
> one wasn't answered.  Then tried the IRC chatroom - boy that was a
> mistake!  The general reception I have received is that if you don't
> know how to do this you have no business being here.  RTFM.  Now, I'm
> not talking about you personally because you have been very civil to
> me and I appreciate that.

Bearing in mind that what you're trying to do (and having read the
earlier thread and obviously paid attention here, I still don't really
know what you're trying to do beyond customise ModelForm in some deep
fashion) *is* in the 10% I spoke about above, you are going to have to
look a bit harder.

I'm sorry you had the experiences you had in IRC. IRC isn't for
everybody and I don't wish to speak ill of others' efforts, so I won't
comment further.

> 
> But I do think this is a general problem in the developer community.
> I'm a beginner to django/python, but not a beginner to programming,
> even object-oriented programming.  I've learned a few languages and
> frameworks over the years and my experience has been similar with all
> of them.  I hit some rather, in retrospect, trivial roadblocks in the
> beginning but once I get over a few humps my understanding accelerates
> exponentially.  But user groups and chat rooms have been, overall, the
> least helpful - or even demoralizing - tools for me.  I really don't
> think I'm alone, either.

Well, I hate to put it like this, since some people get upset at having
it pointed out that this is Open Source and we are all volunteers, but
things like IRC chat rooms are run by volunteers who have time. So if
you think a beginner's room is what's required, organise yourself and a
few people to set one up. You can get publicity for it pretty easily
(post here, send a note to "this week in Django", etc) and see what
happens. Right now, all the people helping out are doing so (hopefully)
to the best of their ability and available 

Re: charts in django

[Ned Batchelder]

Pygooglechart is a good interface to the Google charting API: 
http://pygooglechart.slowchop.com/

--Ned.
http://nedbatchelder.com

Chris Haynes wrote:
> I need to generate some line charts and bar graphs from django. I
> recall seeing a very promissing package a couple months ago and can't
> find it now.
>
> There's pychart, but it hasn't been maintained for a couple years and
> I question its staying power, and it just generates images. open-flash-
> chart has a python binding, but its documentation is very sketchy and
> I don't know how good its support is. visifire looks like it has a
> great future, but depends on silverlight which is not widely deployed
> yet.
>
> Any other ideas or comments on the above?
>
> Thanks,
> Chris Haynes
>
>
> >
>
>
>   

-- 
Ned Batchelder, http://nedbatchelder.com



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Re: Apps and static/media files

[Malcolm Tredinnick]

On Fri, 2009-01-30 at 00:57 +0200, Erik Allik wrote:
> I'm having a situation in which two of my reusable apps both use  
> FCKeditor in their admin interface. Since both of them require  
> FCKeditor library files, I'm confused which one should provide them?  
> Both? How? What is the idiomatic/standard way of doing this? Should I  
> instead have them both just assume "{{ MEDIA_URL }}lib/fckeditor/ 
> fckeditor.js" exists and document this requirement/assumption in the  
> docs of both apps?
> 
> (This is a general media/static files question, I'm just bringing  
> FCKeditor as an example.)

I'd do the latter. Whether you use MEDIA_URL or some other URL for
static, unchanging media is up to you. MEDIA_URL is the brother of
MEDIA_ROOT and is required for file upload support, but it isn't
necessarily going to be the only place you use to serve static files.

Regards,
Malcolm



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Re: reason for missing readline() in uploaded files?

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 15:40 -0500, Todd O'Bryan wrote:
> I'm trying to validate an uploaded csv file, so I want to read the
> first line of text and if it's not the right format, send an error
> message. Unfortunately, neither InMemoryUploadedFile nor
> TemporaryUploadedFile have the readline() method.
> 
> Was that an oversight (in which case I'll create a two-line patch and
> submit it--both StringIO and temp files support the method) or a
> design decision with a good reason?

It's a flaw in Python: what an object needs to be "file-like" is not
well defined. Different users require different things. A file doesn't
really need a readlines() method, except when it does, etc.

There's about half a dozen tickets open for "add X, Y or Z" to the file
stuff, so look through those first.

Regards,
Malcolm



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Re: Cron Job Question

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 11:34 -0800, Chris wrote:
> I have a python / django  script that I have written which will be
> used as a cron. Basically this script goes out to my database and gets
> rows from a given table and performs a specific task then deletes the
> row once finished. What I would like to do is have multiple instances
> of this script running to check for new additions to this table every
> 15 minutes or so. I am not sure how I can divide up the work to be
> processed among all running scripts with out having issues.
> 
> Currently the script does an .objects.all() call and runs through the
> entire list but as mentioned would like to find a way to divide this
> up and with out another instance trying to process a row that is being
> processed by another instance.
> 
> The main question would be how I can tell the script to not process a
> given row b/c another instance of the script is currently processing
> the row or is in its queue to be processed.
> 
> It would also be nice to be to have the ability to add or remove
> instances of the script in times when the table is more or less full
> with rows to process.

In other words, you need a persistent queue. Put things into the queue,
pop the leading element for next processing. There are a lot of options
around. Here's a reasonable place to start:

http://code.google.com/p/queues/

Regards,
Malcolm



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Re: Can I control contents of SELECT in queryset?

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 06:44 -0800, phoebebright wrote:
> I want a distinct list of all the 'cat__names' that exist in
> Subcategory and have at least one entry in Business (Business is a
> subclass of model Directory which might be the problem)
> 
> dir_query = Business.objects.all().select_related().distinct()
> ...
> subcats = dir_query.values('cat__name','cat').select_related().distinct
> ()
> 
> But the SQL this generates has an additional field in the SELECT
> statement which means the DISTINCT does not have the effect I want and
> selects all entries.
> 
> SELECT DISTINCT `town_subcategory`.`name`, `town_business`.`cat_id`,
> `town_directory`.`name`
> FROM `town_business`
> INNER JOIN `town_subcategory` ON (`town_business`.`cat_id` =
> `town_subcategory`.`id`)
> INNER JOIN `town_directory` ON (`town_business`.`directory_ptr_id` =
> `town_directory`.`id`)
> ORDER BY `town_directory`.`name` ASC
> 
> 
> Is there some way of forcing the fields in the select statement
> without having to write the whole SQL in raw format?  Or another way
> of writing the query?

Even if you could do what you wanted here, it wouldn't solve your
problem. You're implicitly using the select fields and the inner join to
enforce the "a name exists" constraint. Django won't just add an
arbitrary table in via an extra inner join if it's not required.

There's a better solution to your problem, though. It's a little hard to
tell what the exact queryset will look like, since I don't understand
your models entirely, but this should be close. Firstly, you want
subcategory names, so that's the model to filter on. the constraint
"must have at least one business" is a filter on the business related
attribute being not-None:

SubCategory.objects.values('name').exclude(business=None)

Regards,
Malcolm



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charts in django

[Chris Haynes]

I need to generate some line charts and bar graphs from django. I
recall seeing a very promissing package a couple months ago and can't
find it now.

There's pychart, but it hasn't been maintained for a couple years and
I question its staying power, and it just generates images. open-flash-
chart has a python binding, but its documentation is very sketchy and
I don't know how good its support is. visifire looks like it has a
great future, but depends on silverlight which is not widely deployed
yet.

Any other ideas or comments on the above?

Thanks,
Chris Haynes


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Re: Django Forms in HTML 4.01 Strict

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 06:36 -0800, Andrew Ingram wrote:
> On Jan 29, 2:18 pm, Gertjan Klein  wrote:
> > This payment thing comes up regularly here, and pollutes the discussion.
> > I have been using Django for a while, and found it to have good things
> > and downsides (both IMHO). I have not even critisized Django here (yet
> > ;)), just expressed mild curiousity. I don't think I've given you reason
> > to bring up that you're not payed for your work on Django.
> 
> Off-topic:
> 
> For what it's worth I agree with you. I've lost track of the number of
> times i've found bugs in open source software and been not-so-subtly
> told to contribute the fix myself. Or asked about something that I
> think should be included and been told to write it myself.
> 
> As a consumer of software libraries it is not my job to fix them,

It's rarely anybody's job to fix them, in the greater scheme of things.
That's the whole point and why I think Gertjan's comment above is an
over-reaction. We are *all* on a level playing field here. If somebody
says something like "I wondered why it isn't in; it doesn't seem like a
lot of work" in a light-hearted manner, they will often get a reply in
the same tone, pointing out one of the many reasons why it isn't in
there is that the person in question hasn't contributed a patch to add
it. Itches get scratched by the people who have them, particularly
enhancement requests.

Sure, sometimes you can't fix the things, but then that's life. You made
that risk evaluation going in.

Regards,
Malcolm



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Re: form for two models - reuse fields generated by modelform

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 03:56 -0800, Markus Bertheau wrote:
> Hi,
> 
> I need a registration form that allows the user to input several
> models. Now just creating two ModelForms and letting a third class
> inherit from them doesn't work, the fields of one model don't show. Is
> there another way to reuse the part of ModelForms that create
> FormFields from ModelFields?

I'd avoid trying to make them into a single form class.

A Form subclass in Django (which includes ModelForms) is only a part of
the HTML-side form. So you can use multiple Form subclasses to generate
a single HTML form.

Furthermore, when you pass data to a form for validation, it ignores any
input that isn't part of the form, so you can pass request.POST to both
forms without having to work out which fields belong to which form. You
might well want to investigate the "prefix" option ([1]) if there's a
chance of field name collision.

By way of example (completely untested, but likely to be close):

def my_view(request):
   if request.method == "POST":
  form_a = ModelAForm(request.POST, prefix="a")
  form_b = ModelBForm(request.POST, prefix="b")
  if form_a.is_valid() and form_b.is_valid():
   # 
   return http.HttpResponseRedirect(...)
   else:
  form_a = ModelAForm(prefix="a")
  form_b = ModelBForm(prefix="b")

   data = {
  "form_a": form_a,
  "form_b": form_b,
   }
   return render_to_response('form.html', data)

If you're doing this with N models (for some large-ish value of N), it's
easy enough to make a loop to create the forms and check validity, etc.
For a different example, see [2].

[1]
http://docs.djangoproject.com/en/dev/ref/forms/api/#prefixes-for-forms
[2]
http://www.pointy-stick.com/blog/2008/01/06/django-tip-complex-forms/

Regards,
Malcolm


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Re: Complex queries with datetime field

[Malcolm Tredinnick]

On Thu, 2009-01-29 at 09:48 +0100, Stefan Tunsch wrote:
>  Well, first of all I can't believe I've overlooked the __in field
> lookup... I wasn't aware of it's existance. Sorry.
> 
> Regarding the __year, __month and __day lookups I'm using in my code:
> I do it because I want to filter all datetime objects of a specific
> day. I want to filter all datetime objects like
> datetime.datetime(2009, 1, 29, 12, 33, 41, 234000) that are in a day
> like datetime.date(2009, 1, 29).
> 
> I would want to do something like
> mydatetimefield__date=datetime.date(2009, 1, 29) but since that option
> does not exist, I am doing this strange thing with year, month and
> day.

Since you've just discovered one new lookup type, it's not going to
shock you that there are other good ones out there, too. Today would be
a good day to learn about "__range":" pass in the midnight and 23:59:59
on the day in question and you're down to two lookups. Or use __gte
midnight and __lt midnight on the following day.

In fact, most databases will treat a date range as being between the two
midnights for datetime columns (SQLite is a little fussy there, but
MySQL and PostgreSQL behave nicely). So, Q(foo__range=(, )) will likely do what you want.

The only reason I'm emphasising these alternatives is that, if you're
doing those queries a lot and need to index those columns for speed,
setting up an index to allow efficient date range comparisons is easier
than creating a functional index for each of the year, month and date
lookups (and, if you're using MySQL, say, you can't even do functional
indexes). Plus, it's a heck of a lot easier to debug at the Python level
with a single datetime object that three variables that have to be
train-wrecked together to work out the date each time.

Regards,
Malcolm



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Re: error when using delete generic views

[Malcolm Tredinnick]

On Wed, 2009-01-28 at 23:47 -0800, Daniel Roseman wrote:
[...]
> No, you have provided four keyword arguments. The signature for the
> delete_object function is as follows:
> def delete_object(request, model, post_delete_redirect,
> object_id=None,
> slug=None, slug_field='slug', template_name=None,
> template_loader=loader, extra_context=None,
> login_required=False,
> context_processors=None, template_object_name='object'):
> 
> So you need to pass request, model and post_delete_redirect *without*
> keywords, as simple positional arguments:
> return delete_object(request, User, '/notify/delete_done/',
> template_name='delete.html', login_required=True)

Everything you've written is correct, except for this bit. You
emphasised the word "without" and that's not necessary. If a Python
function has this signature:

def foo(a, b, c=None, d=6):
   ...

then you can quite happily use keyword arguments for the 'a' and 'b'
parameters. What is different about those parameters is that you *must*
supply them. They don't have default values. So foo(c=6, a=1, b='fred')
would be a valid way to call that function.

The Python error message is slightly misleading here (and it is
generated by Python, not by Django). What they mean is that it takes two
required arguments. By definition (Python's syntax requires it), the
required arguments have to come before any default arguments, so they
can be passed in as positional arguments. But the keyword/non-keyword
argument distinction is actually a bit misleading in this case.

Regards,
Malcolm


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Re: Meta-information for model and form fields

[Malcolm Tredinnick]

On Wed, 2009-01-28 at 23:21 -0800, Vinay Sajip wrote:
[...]
> I was hoping there was another way. Of course subclassing's not hard
> to do, but it means doing it for every field class. I was looking at
> moving an application over from SQLAlchemy, which offers this feature
> both for models and fields.

That's not very natural Python behaviour, though. You can't expect to
pass in extra arbitrary arguments to class constructors for normal
Python classes and have them hold onto it for later collection.

Malcolm


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Re: Three table Lookup Question

[Kyle]

Yes, almost.  It got me to understand the correct syntax.

I noticed that my results were coming according to Industry's primary key,
rather than the Industry integer field, so I appended another __industry

Here is the solution:

Project.objects.filter(campaign__industry__industry=x)

Thank you for your guidance, Todd.

On Thu, Jan 29, 2009 at 12:33 PM, Todd O'Bryan  wrote:

>
> I'm not sure I understand what you're asking, but
>
> projs = Project.objects.filter(campaign__industry=x)
>
> where x is one of 1-6 should do what you want, I think.
>
> Is that what you were asking?
>
> On Thu, Jan 29, 2009 at 9:54 AM, Kyle  wrote:
> >
> > Hello!
> >
> > I am trying to get a list of "Projects" based on certain "Industry".
> > (My naming convention, not django's)
> >
> > My models look like this:
> > http://dpaste.com/114308/
> >
> > "Project" has a foreign key to "Campaign".
> >
> > "Industry" also has a foreign key to "Campaign".
> >
> > Does it matter if both relationships are pointing to the center model
> > in the data route I am trying to setup?  Like this:
> >
> > Project -> Campaign <- Industry
> >
> > If Industry = 3, and a handful of Campaigns are returned, I would like
> > a list of all the Projects contained in each of the Campaigns
> > returned.
> >
> > How do I do this with django models?
> >
> > >
> >
>
> >
>


-- 
Light Emitter
Think in 3D Studios
www.thinkin3d.net

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Re: passing self?

[ajlozier]

Hi Malcolm,

I figured it out.  This article is what pointed me in the right
direction:

http://www.b-list.org/weblog/2008/nov/09/dynamic-forms/

While you are right that there are a lot of examples in the code of
something similar, and that, in theory, I should be able to find the
answer to any question by perusing the source code, it doesn't
necessarily work for beginners - especially beginners who don't have a
strong python background.  I am guessing django wants to attract all
kinds of developers, even those who are just starting to learn python,
am I right?  Or maybe not.

I'd just like to make one observation.  On every page of the django
introductory tutorial there is the following at the bottom:

Questions/Feedback

Having trouble? We'd like to help!

* Try the FAQ — it's got answers to many common questions.
* Search for information in the archives of the django-users
mailing list, or post a question.
* Ask a question in the #django IRC channel, or search the IRC
logs to see if its been asked before.

It sounds so welcoming, but the reality for us beginners is not so
rosy.  I went in this exact order.  Searched the documentation.
Couldn't figure it out.  Posted a question in the user group - first
one wasn't answered.  Then tried the IRC chatroom - boy that was a
mistake!  The general reception I have received is that if you don't
know how to do this you have no business being here.  RTFM.  Now, I'm
not talking about you personally because you have been very civil to
me and I appreciate that.

But I do think this is a general problem in the developer community.
I'm a beginner to django/python, but not a beginner to programming,
even object-oriented programming.  I've learned a few languages and
frameworks over the years and my experience has been similar with all
of them.  I hit some rather, in retrospect, trivial roadblocks in the
beginning but once I get over a few humps my understanding accelerates
exponentially.  But user groups and chat rooms have been, overall, the
least helpful - or even demoralizing - tools for me.  I really don't
think I'm alone, either.

Let me just say that I don't jump to these types of resources quickly
by any means - its always a last resort.  And each time I am hoping
there is someone out there who is kind enough to show me a little
guidance.  But it seems like there is a pretty high threshold for
being welcomed into these communities which is certainly not indicated
in the very welcoming statement: "Having trouble?  We'd like to
help."  In fact I would say the reception for most beginners is pure
hostility.

What usually happens for me is by the time I reach the "threshold" of
knowledge acceptable for user groups or chat rooms, I tend to not want
to go back based on my early experiences.

Perhaps it would be helpful to provide some alternative user groups or
chat rooms for true beginners?  Just an idea.

I hope my comments are somewhat constructive, because that is my only
intention.

Aaron





On Jan 29, 12:40 am, Malcolm Tredinnick 
wrote:
> On Wed, 2009-01-28 at 05:53 -0800, ajlozier wrote:
> > Thank you for responding.
>
> > Yeah I was starting to figure out just what you're saying, that I
> > can't access the functions of a class within the class definition
> > itself.  This is also true in PHP.  In this case, if I were writing in
> > PHP I would do something like this:
>
> > function __construct(){
> >      parent::__construct(); //because this is a subclass
> >      $this->classification = $this->getClassificationTree();
> > }
>
> > I figured I should probably do a similar thing here using the __init__
> > function, but I have run into numerous problems.  It seems I am having
> > trouble matching up the exact parameters of the class this one is
> > inheriting from.  
>
> I don't understand what this means. Can you be a bit more specific?
>
> There are examples all over the Django code (including
> ModelFormBase.__init__) or __init__ methods calling their parent class's
> __init__ method. Search for calls to "super()", which is the standard
> way to call the next method in the name resolution order.
>
> > Believe it or not I can't even seem to find an API
> > page explaining all of the parameters, methods and properties of
> > ModelForm.
> >  I have gone back to the source but so far it hasn't helped
> > me.
>
> Then "API documentation" wouldn't really add much value; it would simply
> repeat the code, in effect (rewriting everything in English again). We
> have documentation describing standard ModelForm usage and we prefer
> holistic descriptions to API dumps. The source isn't particularly
> complicated: everything inherits from BaseModelForm and the __init__
> method's parameters are named for their purpose and they have the same
> names as the parameters in BaseForm.
>
> Hopefully (and necessarily, really) before diving into creating
> derivatives of ModelForm, one has a good general understanding of how
> Django 

Re: #7210 - F() Query Expressions

[Russell Keith-Magee]

On Fri, Jan 30, 2009 at 2:47 AM, koenb  wrote:
>
> This is really great! Thanks all for the good work.
>
> Just curious, has there been any work done to make this also work for
> dates ?
>
> like in
>
> longevents = Event.objects.filter(enddate__gte=F('startdate')+10)

As committed, the expressions framework is fairly dumb - it is really
just a way to do two things:
 1) Expand Django-style field references into column names (and joins
if required)
 2) Turn Python expression trees into SQL expression trees.

This means that the operations that are allowed depend somewhat on the
database in use. For example, on MySQL, you can perform mod operations
on floats; under Postgres, you can't.

Constants in expressions are rendered as-is, so whether dates are
allowed depends on what your database allows. From some quick tests,
date + integer works on SQLite and MySQL -- or, at least, doesn't
throw an error. I haven't confirmed that the answer it gives is
actually meaningful. Postgres complains with an error "operator does
not exist: timestamp with time zone + integer".

However, I'm certainly interested in entertaining any modification to
support more interesting expressions - for example, converting the
expression "F('date') + timedelta(days=3)" into meaningful SQL.
Patches welcome.

Yours,
Russ Magee %-)

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Re: order by count

[lollerikken]

The problem with the sorting method is that I think it will take to much
time. I would like if it could happen as part of the query.

"operator module to get attributes of the object(s) in your QuerySet", I'm
not sure I know how to do this.


I have tried writing it as SQL with cursor:
cursor.execute("SELECT word, ref_id, COUNT(ref_id) c FROM search_searchword
WHERE word LIKE %s OR word=%s GROUP BY ref_id ORDER BY c desc",["%est%",
"test2sf"])  #"SELECT foo FROM bar WHERE baz = %s", [self.word])

It works byt then I have the problem that ref_id is a foreign key and I
would like to have the objects i points to a long as well.

It looks like it is by far easier to find some way to it in Django



Brandon Taylor wrote:
> 
> 
> Hello,
> 
> You can use the sorted() function in Python to order any iterable. It
> asks for a key to order by, which can be a lambda, or you could use
> the operator module to get attributes of the object(s) in your
> QuerySet object to provide the key.
> 
> My $0.02,
> Brandon
> 
> On Jan 29, 12:38 pm, lollerikken  wrote:
>> Hello, sorry about my English, but I hope that it is understandable
>>
>>   I am having some trouble using order_by with Django.
>>
>>   I think it would be easier to explain what I want with an example:
>>
>>   fx if I have this table:
>>
>> key ref
>> 1  a
>> 2  g
>> 3  a
>> 4  c
>> 5  g
>> 6  g
>>
>> I would like to sort it like this:
>>
>> key ref
>> 2  g
>> 5  g
>> 6  g
>> 1  a
>> 3  a
>> 4  c
>>
>> because there is the highest count of g's etc.
>>
>> My google search suggested that I should use something called annotate
>> combined with count, but it does not work.
>> I have tried something like:
>> table.objects.values('key',
>> 'ref').annotate(nr_ref=Count('ref')).order_by('nr_ref')
>> but without any luck.
>> --
>> View this message in
>> context:http://www.nabble.com/order-by-count-tp21732508p21732508.html
>> Sent from the django-users mailing list archive at Nabble.com.
> > 
> 
> 

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Re: ContentTypes and fixtures

[felix]

this has bitten me too recently.

in general I'm moving away from fixtures.  they are breakable, they suffer
when the codebase is refactored.
particularily for tests I no longer use fixtures.

I would suggest trying the dump-to–python-code method




ideally there should be a away to dump a group (or all) objects into some
data structure where all foreign keys are referenced only internally through
some lookup table (that is saved with the objects).

then when loading the structure the objects would be given homes in the
database and the foreign keys would all get resolved into real-world db ids.

there would have to then be a part of the structure that resolved foreign
key ids by a lookup in the host environment where the structure is being
installed (eg looking up the content ids)

the other use for this system would be federating data from site to site.



 felix :crucial-systems.com



On Thu, Jan 29, 2009 at 12:15 AM, Russell Keith-Magee <
freakboy3...@gmail.com> wrote:

>
> On Thu, Jan 29, 2009 at 7:36 AM, Oliver Beattie 
> wrote:
> >
> > How can I be sure that the ContentType IDs are always constant, and
> > therefore my data in fixtures is guaranteed to always point to the
> > right object?
>
> Oliver, meet ticket #7052. Ticket #7052, meet Oliver :-)
>
> This is an annoying bug that I have wanted to address for a while. The
> ticket describes an approach that I believe will work, but doesn't
> contain a patch. On IRC a few days back, Eric Holscher mentioned that
> he had a nasty hack that implemented a fix for this. I don't know how
> far that hack has gone, or if he will be willing to share code.
>
> The best workaround that I can suggest is to include your ContentTypes
> in your fixtures. They are dumpable objects, just like everything else
> in Django. If your fixture contains the content types, it doesn't
> matter what primary key values are automatically created, because they
> will be overwritten by the fixture. You shouldn't get any duplicate
> primary key errors because the fixtures framework overwrites existing
> objects with the same primary key. The only time you need to be
> careful is when you start adding new models, and new content types are
> created - if you don't update your fixtures, you could get some
> interesting side effects.
>
> Yours,
> Russ Magee %-)
>
> >
>

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Apps and static/media files

[Erik Allik]

I'm having a situation in which two of my reusable apps both use  
FCKeditor in their admin interface. Since both of them require  
FCKeditor library files, I'm confused which one should provide them?  
Both? How? What is the idiomatic/standard way of doing this? Should I  
instead have them both just assume "{{ MEDIA_URL }}lib/fckeditor/ 
fckeditor.js" exists and document this requirement/assumption in the  
docs of both apps?

(This is a general media/static files question, I'm just bringing  
FCKeditor as an example.)

Erik

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Re: Improving the response time in Django Admin

[Karen Tracey]

On Thu, Jan 29, 2009 at 5:49 PM, Tipan  wrote:

> I'll go ahead as planned on the Django update and see if this delivers
> any improvements. With regards to your suggestion of using the raw id
> field, is this a Django option, or did you mean changing the FK to
> using a simple ID field. I've been through the docs and can't see any
> reference to a raw_id option, although recall seeing it mentioned on
> some occasion whilst trawling. If an option, can you give me a link?
>

Assuming you're looking for the 1.0 doc:

http://docs.djangoproject.com/en/dev/ref/contrib/admin/#raw-id-fields

Karen

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Re: Improving the response time in Django Admin

[Tipan]

>
> Without specifics, it's a little difficult to say for certain, but one
> of the reasons for the switch to newforms and newforms-admin was to
> eliminate some very expensive querying behavior in the manipulators
> behind forms. This wasn't a matter of one big query that was expensive
> - but you could easily end up with a very large number of very small
> queries. As your user base expands, it's entirely possible that the
> flood of little queries is adding up and slowing down the site.
>
> The other obvious place to look is where Karen noted - Foreign keys
> with very large selection sets. The raw id field option is one way to
> address this; another approach is to write a custom widget that
> doesn't try to load the entire selection set.
>

Thanks, despite my lack of detail this is a good pointer to identify
what to change. I have several tables which use reference an FK on a
larger table. Some of the slower ones don't however, so I'll need to
delve a bit further to see what might be causing it.

I'll go ahead as planned on the Django update and see if this delivers
any improvements. With regards to your suggestion of using the raw id
field, is this a Django option, or did you mean changing the FK to
using a simple ID field. I've been through the docs and can't see any
reference to a raw_id option, although recall seeing it mentioned on
some occasion whilst trawling. If an option, can you give me a link?

Thanks and regards, Tim


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FormWizard accessing previous fields data

[lbologn...@gmail.com]

Hi all,

say i have a FormWizard of 5 steps and at the last step i want to
display a summary of the submitted data how do i access the value of a
field that was in the form at step 1?

example:

class Step1(Form):
  foo = CharField()
  bar = CharField()

So at step 5 i'd like to display the value of Step1.foo.

Thanks,
Lorenzo
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guidance on serialization

[Jason Geiger]

Hello all. Say I have some models like these:

class Image(models.Model):
file = models.ImageField(upload_to=get_image_path)

class Line(models.Model):
image = models.ForeignKey(Image)
color = models.CharField(max_length=20)
width = models.IntegerField()

class Point(models.Model):
line = models.ForeignKey(Line)
ordering = models.IntegerField()
x = models.IntegerField()
y = models.IntegerField()

And I want to load an image and all its lines into the interface, add
and remove lines, and then send it back to the controller.

What's the django-ish way to serialize data like this?

The default serializers doesn't seem to do relationships. I saw
discussion[1] of one that does foreign keys but it seems to be going
to in the opposite direction I want (and it doesn't deserialize yet?).

Stepping back, is this sort of thing that you'd be expected to do with
a custom serializer? Or is it better to just serialize each set of
data separately and save them separately. I started by using
simplejson directly but then was wondering about the built-in
serialization code in Django.

Disclaimer: I'm starting on my first real Django project so I still
have limited knowledge the framework. :)

I'm using 1.0.2.

Thanks!
Jason

[1] 
http://groups.google.com/group/django-users/browse_thread/thread/c930cf920e726bbd/4faa358b8c91365d
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Re: Expression Engine for Django?

[Sean Perry]

On Thu Jan 29 13:49 , "maltebeckm...@mac.com"  sent:

>
>I am an Expression Engine (CMS) fan who recently got convinced that
>Python is way cooler than PHP. Problem is that Expression Engine is
>written in PHP.
>
>Is there an Expression Engine for Django, i.e. an installation package
>that can be deployed by people with less development experience?
>
>I am bringing this up because I love what I have seen of Django so
>far! Thanks for reading!
>

Switching this conversation to the users list where it belongs.

There is no Expression Engine interface for Django that I am aware of and a 
quick
google search does not show anything.

Of course, nothing is stopping someone from duplicating the Expression Engine
functionality in Python for Django (-: There are quite a few blogs powered by
Django these days and writing your own is a great learning opportunity


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Re: Finding and Displaying the Object that a Comment is Created On

[alex.gay...@gmail.com]

On Jan 29, 3:48 pm, "dave.mer...@gmail.com" 
wrote:
> This si a somewhat nooby question.
>
> I have a comment. I want to display the post title for the
> comment.object_id.
>
> In the template I have been trying things like comment.post.title, but
> that is not working.
>
> I think it is due to the fact that Comments use a generic foreign key.
> So... how do I do this?
>
> Any references?
>
> Lemme know.
> Dave

comment.content_object.title
should get what you want
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Re: order by count

[Brandon Taylor]

Hello,

You can use the sorted() function in Python to order any iterable. It
asks for a key to order by, which can be a lambda, or you could use
the operator module to get attributes of the object(s) in your
QuerySet object to provide the key.

My $0.02,
Brandon

On Jan 29, 12:38 pm, lollerikken  wrote:
> Hello, sorry about my English, but I hope that it is understandable
>
>   I am having some trouble using order_by with Django.
>
>   I think it would be easier to explain what I want with an example:
>
>   fx if I have this table:
>
> key ref
> 1  a
> 2  g
> 3  a
> 4  c
> 5  g
> 6  g
>
> I would like to sort it like this:
>
> key ref
> 2  g
> 5  g
> 6  g
> 1  a
> 3  a
> 4  c
>
> because there is the highest count of g's etc.
>
> My google search suggested that I should use something called annotate
> combined with count, but it does not work.
> I have tried something like:
> table.objects.values('key',
> 'ref').annotate(nr_ref=Count('ref')).order_by('nr_ref')
> but without any luck.
> --
> View this message in 
> context:http://www.nabble.com/order-by-count-tp21732508p21732508.html
> Sent from the django-users mailing list archive at Nabble.com.
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Finding and Displaying the Object that a Comment is Created On

[dave.mer...@gmail.com]

This si a somewhat nooby question.

I have a comment. I want to display the post title for the
comment.object_id.

In the template I have been trying things like comment.post.title, but
that is not working.

I think it is due to the fact that Comments use a generic foreign key.
So... how do I do this?

Any references?

Lemme know.
Dave
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reason for missing readline() in uploaded files?

[Todd O'Bryan]

I'm trying to validate an uploaded csv file, so I want to read the
first line of text and if it's not the right format, send an error
message. Unfortunately, neither InMemoryUploadedFile nor
TemporaryUploadedFile have the readline() method.

Was that an oversight (in which case I'll create a two-line patch and
submit it--both StringIO and temp files support the method) or a
design decision with a good reason?

Thanks,
Todd

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Re: Three table Lookup Question

[Todd O'Bryan]

I'm not sure I understand what you're asking, but

projs = Project.objects.filter(campaign__industry=x)

where x is one of 1-6 should do what you want, I think.

Is that what you were asking?

On Thu, Jan 29, 2009 at 9:54 AM, Kyle  wrote:
>
> Hello!
>
> I am trying to get a list of "Projects" based on certain "Industry".
> (My naming convention, not django's)
>
> My models look like this:
> http://dpaste.com/114308/
>
> "Project" has a foreign key to "Campaign".
>
> "Industry" also has a foreign key to "Campaign".
>
> Does it matter if both relationships are pointing to the center model
> in the data route I am trying to setup?  Like this:
>
> Project -> Campaign <- Industry
>
> If Industry = 3, and a handful of Campaigns are returned, I would like
> a list of all the Projects contained in each of the Campaigns
> returned.
>
> How do I do this with django models?
>
> >
>

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Re: Cron Job Question

[Jeff Anderson]

Chris wrote:
> I have a python / django  script that I have written which will be
> used as a cron. Basically this script goes out to my database and gets
> rows from a given table and performs a specific task then deletes the
> row once finished. What I would like to do is have multiple instances
> of this script running to check for new additions to this table every
> 15 minutes or so. I am not sure how I can divide up the work to be
> processed among all running scripts with out having issues.
>   
I'm curious: why do you need multiple instances? The only reason I can
think of is that you need multiple machines to get the tasks done in a
timely manner. Is this the case?

The model that we use for a similar setup is the script will check the
database, process ALL unprocessed rows (no wait in between jobs), and
then when it's done, it waits a few seconds and checks again. This works
very well in production. Most of the time only one or two jobs will be
inserted at a time, but occasionally several hundreds or thousands of
jobs will be inserted. One instance of the worker script handles this
very well. We moved away from the cron job, and implemented a simple
daemon process.

If you really really really need the multiple instances, you could have
a worker script that launches the jobs one at a time, and will only
spawn as many as you need at once. I'd also suggest looking into
database locking or transactions if you want to have multiple scripts
with their fingers in the same table.

Cheers!

Jeff Anderson



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Description: OpenPGP digital signature

Re: Custom authentication backend and User passwords

[Delta20]

Thanks Malcolm.

For anyone interested in this topic, I have created a snippet with my
solution:

http://www.djangosnippets.org/snippets/1301/
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Cron Job Question

[Chris]

I have a python / django  script that I have written which will be
used as a cron. Basically this script goes out to my database and gets
rows from a given table and performs a specific task then deletes the
row once finished. What I would like to do is have multiple instances
of this script running to check for new additions to this table every
15 minutes or so. I am not sure how I can divide up the work to be
processed among all running scripts with out having issues.

Currently the script does an .objects.all() call and runs through the
entire list but as mentioned would like to find a way to divide this
up and with out another instance trying to process a row that is being
processed by another instance.

The main question would be how I can tell the script to not process a
given row b/c another instance of the script is currently processing
the row or is in its queue to be processed.

It would also be nice to be to have the ability to add or remove
instances of the script in times when the table is more or less full
with rows to process.

Thanks in advance.
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Any way to NOT escape a percent sign using 'contains'?

[Adam Stein]

According to the docs, when using 'contains' in filter() a percent sign
or underscore is automatically escaped.  However, in my case I want the
resulting SQL to use the percent sign.

I know 'contains' will fill in the outside percent signs, but it escapes
the percent sign in my string.  So that calling:

Entry.objects.filter(headline__contains='a%b')

will result in:

SELECT ... WHERE headline LIKE '%a\%b%';

but I want it to be this instead:

SELECT ... WHERE headline LIKE '%a%b%';

This there an easy way to do this?

I could use regexp, but I didn't want people to know that they would
have to use "a.*b" instead of "a*b", just trying to make it simplier for
myself and the people using the system.
-- 
Adam Stein @ Xerox Corporation   Email: a...@eng.mc.xerox.com

Disclaimer: Any/All views expressed
here have been proven to be my own.  [http://www.csh.rit.edu/~adam/]


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order by count

[lollerikken]

Hello, sorry about my English, but I hope that it is understandable

  I am having some trouble using order_by with Django.

  I think it would be easier to explain what I want with an example:

  fx if I have this table:

key ref
1  a
2  g
3  a
4  c
5  g
6  g

I would like to sort it like this:

key ref
2  g
5  g
6  g
1  a
3  a
4  c

because there is the highest count of g's etc.

My google search suggested that I should use something called annotate
combined with count, but it does not work.
I have tried something like:
table.objects.values('key',
'ref').annotate(nr_ref=Count('ref')).order_by('nr_ref')
but without any luck.
-- 
View this message in context: 
http://www.nabble.com/order-by-count-tp21732508p21732508.html
Sent from the django-users mailing list archive at Nabble.com.


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Re: Custom Template Tag - Passing variable for use in tag processing

[phoebebright]

This is the final code which works in case it helps anyone else.
Thanks again.

In the template:

{% page_links category %}



In templatetags file

@register.tag(name="page_links")
def get_page_links(parser,token):

tag_name, category = token.contents.split()

return PageLink(category)


class PageLink(template.Node):

def __init__(self, category):

self.category = template.Variable(category)

def render(self, context):
cat = self.category.resolve(context)

if cat=='business':
pages=BusinessPage.objects.filter
(is_live=True).select_related().order_by('order')
elif cat=='community':
pages=CommunityPage.objects.filter
(is_live=True).select_related().order_by('order')
elif cat=='tourism':
pages=TourismPage.objects.filter
(is_live=True).select_related().order_by('order')

else:
pages = False


context['pages'] = pages

return ''



On Jan 29, 3:22 pm, phoebebright  wrote:
> You understood perfectly.  It was just another case of my not
> understanding the documentation.  Your explanation makes perfect
> sense.
>
> Many thanks.
>
> On Jan 27, 6:45 pm, Eric Abrahamsen  wrote:
>
> > On Jan 28, 2009, at 1:52 AM, phoebebright wrote:
>
> > > I have duplicated as best I can the processing for handling variables
> > > incustomtemplatetagsmentioned in an earlier post but it's not
> > > working for me as I need the value of the variable before I parse it.
> > > Is there another way of making the variable available?
>
> > > The tag is being called from the tempalte with:
>
> > > {% page_links "category"  %}
>
> > > Where category is being passed into thetemplatefrom a view.  (also
> > > tried "{{category}}" and {{category}} and category)
>
> > > I want to use the value of category to determine which list of pages
> > > to return.
>
> > > I KNOW THIS DOESN"T WORK:
>
> > > @register.tag(name="page_links")
> > > def get_page_links(parser,token):
> > >    tag_name, cat = token.contents.split()
> > >    return PageLink(cat[1:-1])
>
> > > class PageLink(template.Node):
>
> > >    def __init__(self, cat):
>
> > >        cat=template.Variable(cat)
> > >        print cat   <-  outputs category
> > >        if cat=='business':
> > >            pages=BusinessPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > >        elif cat=='community':
> > >            pages=CommunityPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > >        elif cat=='tourism':
> > >            pages=TourismPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
>
> > >        else:
> > >            pages = False
>
> > >            self.pages = pages
>
> > >    def render(self, context):
> > >        context['pages'] = self.pages
>
> > >        return ''
>
> > I might be missing something you're trying to do here, but the usual  
> > method for resolving a variable in acustomtemplatetag is to first  
> > put it into the tag (without quotes) like so:
> > {% page_links category %}
>
> > Then attach that to your PageLink node in its __init__ method as a  
> > Variable:
> > self.cat =template.Variable(cat)
>
> > Then inside the render method first resolve it:
> > category = self.cat.resolve(context)
>
> > and then check the value of category against your various models. That  
> > all has to be done in render, not __init__, because context is only  
> > available in render.
>
> > This is all straight out of the 
> > docs:http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#pass...
>
> > Apologies in advance if I've misunderstood what you're trying to do...
>
> > Eric
>
> > > This code works fine as long as I call it like this:
>
> > > {% page_links "business" %}
>
> > > @register.tag(name="page_links")
> > > def get_page_links(parser,token):
>
> > >        tag_name, cat = token.contents.split()
> > >        cat = cat[1:-1]
>
> > >        if cat=='business':
> > >            pages=BusinessPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > >        elif cat=='community':
> > >            pages=CommunityPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > >        elif cat=='tourism':
> > >            pages=TourismPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > >        else:
> > >            pages = False
>
> > >        return PageLink(pages)
>
> > > class PageLink(template.Node):
>
> > >    def __init__(self, pages):
> > >        self.pages = pages
>
> > >    def render(self, context):
> > >        context['pages'] = self.pages
>
> > >        return ''
>
>
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Re: #7210 - F() Query Expressions

[koenb]

This is really great! Thanks all for the good work.

Just curious, has there been any work done to make this also work for
dates ?

like in

longevents = Event.objects.filter(enddate__gte=F('startdate')+10)

or something like that ?

Koen

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Re: Can I control contents of SELECT in queryset?

[phoebebright]

That's an interesting post but I havn't managed to get it to solve my
problem because I'm looking for a list of all categories and that
method using FOO_set only seems to work on a single object (get).

Also tried the raw sql method but I get an SQL error

(1064, "You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near ''business' td, town_subcategory sc WHERE td.cat_id = sc.id' at
line 1")

Even though if I run the sql manually it is fine.

from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT DISTINCT sc.name, sc.id FROM  town_%s td,
town_subcategory sc WHERE td.cat_id = sc.id", [for_cat])
subcats = cursor.fetchall()

Any further thoughts most welcome!

On Jan 29, 3:48 pm, Almost George 
wrote:
> On Jan 29, 8:44 am, phoebebright  wrote:
>
>
>
> > I want a distinct list of all the 'cat__names' that exist in
> > Subcategory and have at least one entry in Business (Business is a
> > subclass of model Directory which might be the problem)
>
> > dir_query = Business.objects.all().select_related().distinct()
> > ...
> > subcats = dir_query.values('cat__name','cat').select_related().distinct
> > ()
>
> > But the SQL this generates has an additional field in theSELECT
> > statement which means the DISTINCT does not have the effect I want and
> > selects all entries.
>
> >SELECTDISTINCT `town_subcategory`.`name`, `town_business`.`cat_id`,
> > `town_directory`.`name`
> > FROM `town_business`
> > INNER JOIN `town_subcategory` ON (`town_business`.`cat_id` =
> > `town_subcategory`.`id`)
> > INNER JOIN `town_directory` ON (`town_business`.`directory_ptr_id` =
> > `town_directory`.`id`)
> > ORDER BY `town_directory`.`name` ASC
>
> > Is there some way of forcing the fields in theselectstatement
> > without having to write the whole SQL in raw format?  Or another way
> > of writing the query?
>
> Have you tried any of the methods listed in this 
> article?http://thisweekindjango.com/articles/2007/dec/21/retrieving-selective...
> ( Retrieving Selective Fields with Django )
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Sending emails through Microsoft Exchange in django?

[Bryant]

Hi all,

I was just wondering if anyone has tried sending mail through
Microsoft exchange. What information do I need, and will it work with
django's smtp functions?

Thanks!

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Re: media files apache/modpython windows

[May]

Ok, I think I finally got it!  In order to use my css template as a
django inherited base.html(which is under folder-template) I have to
place my html(ex. index.html) pages under the same folder "template",
which is specified as a directory path in the settings.py file under
TEMPLATE_DIRS:
'C:/folder/subfolder/templates',

However, if I want any CSS or images to be used in index.html I must
place them in a separate folder in a directory called site_media.
(the media folder actually refers to the css for my admin files).  For
media and site_media to work I need to add the following to my
settings.py file:
For the site css and images:
MEDIA_ROOT = 'C:/folder/subfolder/site_media'
MEDIA_URL = 'http://localhost/site_media/'

For the admin css:
ADMIN_MEDIA_PREFIX = 'http://localhost/media/'

But the media(admin css) and site_media(my css and images) won't work
under apache until I add the following to the http.conf file:

  ServerName http://localhost
  Alias /media C:/djangopath/folders/admin/media
  
SetHandler python-program
PythonHandler django.core.handlers.modpython
PythonDebug On
Allow from all
  

SetHandler None


SetHandler None



But, one more complication occurs.  When I select any link under the
template folder (which is supported by the django server, I also must
specify that link in the URL.py and View.py. That link looks like
this:
 http://localhost/index; >index file
URL:  (r'^index/$', 'index'),
VIEW:  def index(request):
  return render_to_response('index.html', RequestContext(request))

Any link selected from the site_media folder is controlled by Apache,
so I don't need to put anything in URL.py or View.py.  That link looks
like this:
http://localhost/site_media/images/image.gif"/>

All the above now works well for me and I hope that it is the simplest
configuration.  I am placing all this code here with the sincere hope
that someone else will find it useful, because no matter how many
times I read the django documentation it doesn't explain any of the
above very well.  I am a PHP programmer, so maybe my previous
experience tainted me from looking at the django configuration
differently than how I would have built a web page in PHP under
Apache.

Thank you for all your help and please comment if I am incorrect or if
the configuration could be made easier.

May


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Re: Changing comments preview form

[Florian Lindner]

Am 29.01.2009 um 01:59 schrieb Malcolm Tredinnick:

>
> On Wed, 2009-01-28 at 19:24 +0100, Florian Lindner wrote:
>>
>> Am 28.01.2009 um 05:19 schrieb Malcolm Tredinnick:
>>
>>>
>>> On Tue, 2009-01-27 at 20:11 +0100, Florian Lindner wrote:
 Hello,

 I'm playing around with the contrib.comments framework. I want to
 change the preview form. For that I've copied preview.html to xgm/
 Blog/
 templates/comments (xgm is my project, Blog is app). My template
 loaders are:

 TEMPLATE_LOADERS = (
'django.template.loaders.app_directories.load_template_source',
'django.template.loaders.filesystem.load_template_source',
 )

 But modification I make to the preview.html in my app dir does not
 seem to be noticed.
>>>
>>>
>>> For comments, if you're only wanting to change the preview form  
>>> for a
>>> particular model or particular application, note that the template
>>> loaded for preview is not comments/preview.html, always. That is the
>>> name that is loaded is all else fails. However, the application  
>>> first
>>> looks for
>>>
>>>   comments/__preview.html
>>>   comments/_preview.html
>>>
>>> where  is the name of the application and  is the name  
>>> of
>>> the model to which the comment is attached. If either of those
>>> templates
>>> are found, they are used for preference. So for an app-specific
>>> customisation for an app called "foo", say, you could create
>>>
>>>   comments/foo_preview.html
>>>
>>> in the foo/templates/ directory and it will be loaded for the  
>>> preview.
>>
>> Hi!
>>
>> Thanks for your answer. I decided to take the latter way. Thus I've
>> copied preview.html to Blog_Entry_preview.html in the templates/
>> comments/ directory and it worked perfectly. I tried the same copying
>> with the posted.html to Blog_Entry_posted.html but this does not  
>> work.
>> My Blog_Entry_posted.html simply seems to be ignored.
>>
>> Any idea what I could have made wrong? I've double checked  
>> everything...
>
> So, for the future: It took about 30 seconds to grep through the
> comments source (in django.contrib.comments) to find where posted.html
> is used and see that it's doesn't allow that customisation (which is
> also how I found that preview.html is the third of three things
> checked).
>
> Remember, Django is in Python. The source is your friend.

Ok, you're right. I've searched through Google but didn't got the idea  
to grep the code. My apologies.
Is there any reason why this lookup is not implemented for all  
comments templates? If not I'll try to create a patch and commit into  
the ticket system.

Regards,

Florian.


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Re: views, templates, render and groups

[garagefan]

ok... i'm trying to use exclude in the query set to get this to work.
I'm not entirely sure how my logic should go though...

especially since i would be comparing to lists that would result in <>
not being usable... since a user and a group won't contain the same
set of groups.

is it possible to do use a boolean? i realize list.index(x) returns an
error, not a -1 as in java... so how would i get about including a

forumgroup.index(User.groups) > -1

of course... that only works if there is one group assigned to the
user... i would have to check each group...

I'm sure this is a simple logic issue... but i can't seem to figure
out what i'd need to do

On Jan 19, 1:50 pm, garagefan  wrote:
> pretty vague title i know...
>
> Can I return a query set via  foo.object.filter() where in filter i
> check a manytomany field in foo against the group field for a user?
>
> I guess a way to use a group as a permission?
>
> IE: An article that would normally appear with a ton of other
> articles, in a ManyToMany field tied to groups has been set to Group1.
> Now a handful of users are in Group1 and that article is only supposed
> to be visible to those people, as well as the other non-group assigned
> articles in the list.
>
> I'd like to take care of this in the views in the render for the
> template so that only the objects that can be viewed are passed
> through. It seems that permissions are set up by django based on the
> models themselves, and i haven't seen anything on creating custom
> permissions for groups themselves. So any of the permission check
> functions would not work.
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Re: can i use models like that??

[Mirat Can Bayrak]

well  thank you, what do you think about this one? is that possible? 


class Product(models.Model):
name = models.CharField(max_length=50)
slug = models.SlugField()
preview_animation = models.ImageField(upload_to = "animations")

class Game(Product)
another_properties = CharField..
...
...

-- 
Mirat Can Bayrak 

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Re: links in table - one for URL, one not

[May]

Thanks all!  I needed to put the curly brackets around the website
variable.  Dumb mistake on my part.  It works now!

Thanks!


{{ researchproject.institution|
> > safe }}

On Jan 28, 2:15 pm, Karen Tracey  wrote:
> On Wed, Jan 28, 2009 at 4:28 PM, May  wrote:
>
> > Hello,
>
> > I am extracting data from a postgres table into an html table.  I have
> > two columns.
>
> > The user can select the link in this column, the link will be returned
> > through the URL and view.py to extract more information from the
> > postgres table:
> >  {{ researchproject.restitle|
> > safe }}
>
> > This column will have the http:// address for an institution, which I
> > would like the user to be able to directly link to an external
> > website.  My error is that django won't allow me to directly link to
> > an external website without first assigning a URL and a view.  How can
> > I override django on this?
>
> > {{ researchproject.institution|
> > safe }}
>
> > Thanks for any help.
>
> What do you mean "django won't allow me to directly link to an external
> website"?  Django doesn't care what links you include on your pages.  In the
> example you give you are specifying "researchproject.website" as an href.
> That's a relative link, so when you click on it the browser will request the
> linked page from the same server where it got the page containing the link.
> If you want to link to an entirely different site, you need to specify your
> href value to reflect that, something more like:
>
> http://researchproject.website;>{{ researchproject.institution
>
> }}
>
> Karen
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Re: Can I control contents of SELECT in queryset?

[Almost George]

On Jan 29, 8:44 am, phoebebright  wrote:
> I want a distinct list of all the 'cat__names' that exist in
> Subcategory and have at least one entry in Business (Business is a
> subclass of model Directory which might be the problem)
>
> dir_query = Business.objects.all().select_related().distinct()
> ...
> subcats = dir_query.values('cat__name','cat').select_related().distinct
> ()
>
> But the SQL this generates has an additional field in the SELECT
> statement which means the DISTINCT does not have the effect I want and
> selects all entries.
>
> SELECT DISTINCT `town_subcategory`.`name`, `town_business`.`cat_id`,
> `town_directory`.`name`
> FROM `town_business`
> INNER JOIN `town_subcategory` ON (`town_business`.`cat_id` =
> `town_subcategory`.`id`)
> INNER JOIN `town_directory` ON (`town_business`.`directory_ptr_id` =
> `town_directory`.`id`)
> ORDER BY `town_directory`.`name` ASC
>
> Is there some way of forcing the fields in the select statement
> without having to write the whole SQL in raw format?  Or another way
> of writing the query?

Have you tried any of the methods listed in this article?
http://thisweekindjango.com/articles/2007/dec/21/retrieving-selective-fields-django/
( Retrieving Selective Fields with Django )
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middleware response processing always occurs

[George Lund]

We recently uncovered a bug in our code, which was pretty confusing,
and is explainable only via the fine-print of
http://docs.djangoproject.com/en/dev/topics/http/middleware/ -- and
reading through the Django source.  So I thought I'd share, and maybe
a Django developer might comment on whether the current behaviour is
really desirable, and if so perhaps consider improving the docs.

We have some Middleware that updates the user's session, from a
process_response method.  Sometimes this would fail, because the
request object had no session.

It turns out this would happen because the Common middleware had
issued a redirect (specifically, APPEND_SLASH was redirecting us to
correct the view's URL).

In a case like this, the current behaviour is not like the 'onion' as
illustrated in the docs, because whilst the redirect meant that *only*
the Common middleware had its process_request function executed, every
loaded middleware's process_response is executed.  (This is mentioned
in the docs, it turns out, in the process_request section but not in
the process_response section.)

What this means is that even though it seems, and is the case 99% of
the time, that middleware listed later can rely totally on middleware
further up the list (i.e. the 'onion' model), this is in fact not the
case, for processing responses.  So response processing code is either
subject to rare bugs, or has to contain extra checks to make sure of
its preconditions (in our case a check for hasattr(request,
'session') ).

Personally I think this is confusing enough that it would be better if
the program logic could be changed, so that later-listed middleware
would definitely only either run, or not run, depending on whether the
earlier middleware allows the request to proceed or not.  But I guess
such a change could break existing code, so at the very least the docs
could use a bit more explanation and or highlighting in bold!

thanks

George Lund


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Re: Custom Template Tag - Passing variable for use in tag processing

[phoebebright]

You understood perfectly.  It was just another case of my not
understanding the documentation.  Your explanation makes perfect
sense.

Many thanks.

On Jan 27, 6:45 pm, Eric Abrahamsen  wrote:
> On Jan 28, 2009, at 1:52 AM, phoebebright wrote:
>
>
>
>
>
> > I have duplicated as best I can the processing for handling variables
> > incustomtemplatetagsmentioned in an earlier post but it's not
> > working for me as I need the value of the variable before I parse it.
> > Is there another way of making the variable available?
>
> > The tag is being called from the tempalte with:
>
> > {% page_links "category"  %}
>
> > Where category is being passed into thetemplatefrom a view.  (also
> > tried "{{category}}" and {{category}} and category)
>
> > I want to use the value of category to determine which list of pages
> > to return.
>
> > I KNOW THIS DOESN"T WORK:
>
> > @register.tag(name="page_links")
> > def get_page_links(parser,token):
> >    tag_name, cat = token.contents.split()
> >    return PageLink(cat[1:-1])
>
> > class PageLink(template.Node):
>
> >    def __init__(self, cat):
>
> >        cat=template.Variable(cat)
> >        print cat   <-  outputs category
> >        if cat=='business':
> >            pages=BusinessPage.objects.filter
> > (is_live=True).select_related().order_by('order')
> >        elif cat=='community':
> >            pages=CommunityPage.objects.filter
> > (is_live=True).select_related().order_by('order')
> >        elif cat=='tourism':
> >            pages=TourismPage.objects.filter
> > (is_live=True).select_related().order_by('order')
>
> >        else:
> >            pages = False
>
> >            self.pages = pages
>
> >    def render(self, context):
> >        context['pages'] = self.pages
>
> >        return ''
>
> I might be missing something you're trying to do here, but the usual  
> method for resolving a variable in acustomtemplatetag is to first  
> put it into the tag (without quotes) like so:
> {% page_links category %}
>
> Then attach that to your PageLink node in its __init__ method as a  
> Variable:
> self.cat =template.Variable(cat)
>
> Then inside the render method first resolve it:
> category = self.cat.resolve(context)
>
> and then check the value of category against your various models. That  
> all has to be done in render, not __init__, because context is only  
> available in render.
>
> This is all straight out of the 
> docs:http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#pass...
>
> Apologies in advance if I've misunderstood what you're trying to do...
>
> Eric
>
>
>
> > This code works fine as long as I call it like this:
>
> > {% page_links "business" %}
>
> > @register.tag(name="page_links")
> > def get_page_links(parser,token):
>
> >        tag_name, cat = token.contents.split()
> >        cat = cat[1:-1]
>
> >        if cat=='business':
> >            pages=BusinessPage.objects.filter
> > (is_live=True).select_related().order_by('order')
> >        elif cat=='community':
> >            pages=CommunityPage.objects.filter
> > (is_live=True).select_related().order_by('order')
> >        elif cat=='tourism':
> >            pages=TourismPage.objects.filter
> > (is_live=True).select_related().order_by('order')
> >        else:
> >            pages = False
>
> >        return PageLink(pages)
>
> > class PageLink(template.Node):
>
> >    def __init__(self, pages):
> >        self.pages = pages
>
> >    def render(self, context):
> >        context['pages'] = self.pages
>
> >        return ''
>
>
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Three table Lookup Question

[Kyle]

Hello!

I am trying to get a list of "Projects" based on certain "Industry".
(My naming convention, not django's)

My models look like this:
http://dpaste.com/114308/

"Project" has a foreign key to "Campaign".

"Industry" also has a foreign key to "Campaign".

Does it matter if both relationships are pointing to the center model
in the data route I am trying to setup?  Like this:

Project -> Campaign <- Industry

If Industry = 3, and a handful of Campaigns are returned, I would like
a list of all the Projects contained in each of the Campaigns
returned.

How do I do this with django models?

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Re: Any django users in Malaysia/Singapore

[digicase]

Hi, I'm in Singapore.

I'm building a django/satchmo site right now. I have worked on about
ten Django sites in the past, and for a Singapore client in particular
we just completed http://www.asiansecurity.org/

Good to know there are other Django users here!

Cheers,
Arthur

On Jan 29, 2:00 pm, Kelvin Quee  wrote:
> From Singapore here. We have at least 1 Django expert in our company.  :)
>
> Kelvin Quee
> k...@kquee.com
> +65 9177 3635
>
> http://kquee.com
>
> 2009/1/29 ycloh :
>
>
>
> > Yeah, would have been nice if there was some sharing, which is why i
> > wanted to know if there were users in KL or Sin. Would be nice to at
> > least arrange some sort of get together/ teh tarik session, if there
> > were enough developers around.
>
> > On Jan 29, 9:15 am, Bond Lim  wrote:
> >> Hi, I am from Malaysia and currently using django. Too bad is that in
> >> Malaysia, we do not have any python or django conference,
>
> >> On Wed, Jan 28, 2009 at 04:58:09PM -0800, ycloh wrote:
>
> >> > Hi all, just wondering if there are many django users in this part of
> >> > this world and how is django being used.

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Can I control contents of SELECT in queryset?

[phoebebright]

I want a distinct list of all the 'cat__names' that exist in
Subcategory and have at least one entry in Business (Business is a
subclass of model Directory which might be the problem)

dir_query = Business.objects.all().select_related().distinct()
...
subcats = dir_query.values('cat__name','cat').select_related().distinct
()

But the SQL this generates has an additional field in the SELECT
statement which means the DISTINCT does not have the effect I want and
selects all entries.

SELECT DISTINCT `town_subcategory`.`name`, `town_business`.`cat_id`,
`town_directory`.`name`
FROM `town_business`
INNER JOIN `town_subcategory` ON (`town_business`.`cat_id` =
`town_subcategory`.`id`)
INNER JOIN `town_directory` ON (`town_business`.`directory_ptr_id` =
`town_directory`.`id`)
ORDER BY `town_directory`.`name` ASC


Is there some way of forcing the fields in the select statement
without having to write the whole SQL in raw format?  Or another way
of writing the query?
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Re: Django Forms in HTML 4.01 Strict

[Andrew Ingram]

On Jan 29, 2:18 pm, Gertjan Klein  wrote:
> This payment thing comes up regularly here, and pollutes the discussion.
> I have been using Django for a while, and found it to have good things
> and downsides (both IMHO). I have not even critisized Django here (yet
> ;)), just expressed mild curiousity. I don't think I've given you reason
> to bring up that you're not payed for your work on Django.

Off-topic:

For what it's worth I agree with you. I've lost track of the number of
times i've found bugs in open source software and been not-so-subtly
told to contribute the fix myself. Or asked about something that I
think should be included and been told to write it myself.

As a consumer of software libraries it is not my job to fix them,
maybe there will come a time when I choose to spend some time
contributing back to the projects, but there is a lot of overhead
involve in learning enough of how a library works to write patches and
not everyone can spare this.  Additionally some of us simply aren't
smart enough to fix/add features we want.

Your reasoning for wanting this functionality is reasonable, as is
Malcom's explanation for why it has yet to be done (nobody has agreed
on the best way to do it)

Regards,
Andrew Ingram
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Re: Getting Logged in User with Test Client

[Vitaly Babiy]

Malcolm thanks for the feedback and your right, I agree with you that the
client should not know about the user.
Vitaly Babiy


2009/1/26 Malcolm Tredinnick 

>
> On Sat, 2009-01-24 at 12:14 -0500, Vitaly Babiy wrote:
> >  Yes either way would work I was just wondering if there was a more
> > cleaner way of doing so.
>
> Then you're going to have to define what "cleaner" means from your
> persepctive. What could be cleaner that simply get()-ing the right model
> based on the unique piece of identifying information (the username)?
> It's one line of code.
>
> The browser-emulating side (self.client) doesn't and shouldn't care
> about that, since it's the browser-side of the test, not the
> server-side.
>
> Regards,
> Malcolm
>
>
> >
>

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Re: Django Forms in HTML 4.01 Strict

[Gertjan Klein]

Malcolm Tredinnick wrote:

>On Wed, 2009-01-28 at 14:33 +0100, Gertjan Klein wrote:
>> Malcolm Tredinnick wrote:
>> 
>> I disagree. When I develop web pages (using Django or otherwise) I use
>> the Firefox HTML validator extension. This helps me write
>> standards-compliant HTML -- a big red cross indicates a problem in my
>> page. It is annoying if that big red cross no longer indicates anything
>> (there might be problems *I* caused, or it might just be Django stuff).
>
>You realise that you're effectively confirming what I said, right?. The
>big red cross is a cosmetic issue. The fact that it makes precisely zero
>difference to the practical matter of how a real-world web browser
>processes the page means it's not fatal/tragic.

No, I think you may have misunderstood me. The XHTML slash is cosmetic;
to my knowledge, all current browsers are capable of dealing with that
(thus deviating from what the standard dictates them to do, but
practicality beats purity, I guess ;)).

However, *my* HTML (as opposed to Django's generated HTML) may contain
errors as well, and regularly does. The big red cross in an invaluable
indicator that I messed something up, and losing that functionality is
annoying. Now, when using HTML as opposed to XHTML, I can no longer see
if I did something wrong, as the page is *always* in error (from a
standards compliance POV).

>Then you'll have no trouble creating a parallel set of form widgets or a
>form framework that can handle this and everybody will be happy. :-)

No, I have no desire to do such a thing. As I stated before, the
practical solution for me was to switch to XHTML.

>Or look at the django-html project on Google Code, where various ideas
>are being tried out.

I did, briefly, and didn't like what I saw. They overcomplicate things,
IMHO. I don't want DOCTYPE management, for example.

>(you're certainly paid just as much to work on Django as me, for
>example).

This payment thing comes up regularly here, and pollutes the discussion.
I have been using Django for a while, and found it to have good things
and downsides (both IMHO). I have not even critisized Django here (yet
;)), just expressed mild curiousity. I don't think I've given you reason
to bring up that you're not payed for your work on Django.

>Maintaining two copies of everything certainly adds to the workload.

I have not suggested such thing though. From a brief look at the source
code, it appeared to me that it would be easy to create a setting that
specifies whether to include the slash or not, and based on that setting
write either " />" or ">" at the end of input tags (and ). However,
like I said, I have not researched this thouroughly, and I most
certainly have not requested the Django developers to implement this. I
may have overlooked more complicated things, and besides, if I wanted
this badly I'd try and write it myself and if successfull, attempt to
get it included in Django.

Regards,
Gertjan.



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Re: absolute_import, app names, dots, and a bug

[Todd O'Bryan]

On Wed, Jan 28, 2009 at 11:49 PM, Malcolm Tredinnick
 wrote:
>
> On Wed, 2009-01-28 at 22:50 -0500, Karen Tracey wrote:
>>
>> No, I don't think that's an accurate representation of the status.
>> The triage state is Accepted and furthermore Malcolm even assigned it
>> to himself, meaning he's intending to fix it.  Per this comment:
>>
>> http://code.djangoproject.com/ticket/8193#comment:20
>>
>> working on the fix has revealed other problems so it is not as simple
>> as one might hope.  So it's in the queue to be fixed, probably (I'm
>> just guessing) prioritized behind some 1.1 feature work.
>
> That's correct. Also, this particular thread has provided the first
> example of standard behaviour causing a problem, which is something
> that's been requested a few times in that ticket and related threads.
>
> It will be fixed for 1.1. Since we now have a case of normal Python
> usage triggering a problem, it will also be back-ported to the 1.0
> branch. All in good time.
>
> For now, not using "from __future__ ..." is an acceptable workaround.
> Live in the present, not the future for a little while. :-)

I misspoke. I should have said, "...people think it's a bug without
consequences."

I also realize my message could have been read in a demanding, annoyed
way rather than in the teasing, needling way in which I meant it. I'm
okay with living in the present. Especially since I've had four whole
days to work on Django stuff since my school district (I teach CS at
the high school level.) is closed all week because of an ice storm
that has knocked out power at about 1/3 of the schools.

Todd

P.S. One of my former students has made a few thousand dollars writing
Django sites since he graduated last May. Best advertising for my
advanced classes I've ever had. :-)

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Re: Has anyone looked into writing an SSH backend for file uploads?

[Andrew Ingram]

On Jan 29, 1:19 pm, Christian Joergensen  wrote:
> What if one of the machines was unresponsive at the time of the upload?

One option would be to have all the files uploaded locally, but the
handler would additionally copy to the other locations. The other
would just to be to have some exception handling. File uploads aren't
a site user task for us, so short periods of broken upload
capabilities are tolerable.
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Re: Has anyone looked into writing an SSH backend for file uploads?

[Christian Joergensen]

Andrew Ingram wrote:

[...]

> Ideally you'd be able to provide it with a tuple of machines to
> connect to which would allow you to upload to all the machines at once
> (but even if there's one that only allows you to upload to one machine
> that would still be useful).

What if one of the machines was unresponsive at the time of the upload?

Regards,

-- 
Christian Joergensen
http://www.technobabble.dk

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Re: Admin screen counts correctly but returns no records

[JonUK]

Thanks Daniel, I'll take your advice.

I'm surprised (i.e. don't understand why) this approach is problematic
though.
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Has anyone looked into writing an SSH backend for file uploads?

[Andrew Ingram]

Hi All,

At the moment our Django apps run on the same server that the static
images are served from, we are looking to change this to improve
redundancy.

Has anyone created (or attempted to create) a new file backend that
uses SSH?

Ideally you'd be able to provide it with a tuple of machines to
connect to which would allow you to upload to all the machines at once
(but even if there's one that only allows you to upload to one machine
that would still be useful).

Regards,
Andrew Ingram
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Re: Admin screen counts correctly but returns no records

[Daniel Roseman]

On Jan 29, 12:00 pm, JonUK  wrote:
> I'm creating a new admin UI for User, separate to the standard admin
> User interface - I have the following setup:
>
> class WebsiteUser( User ):
>     class Meta:
>         db_table = 'auth_user'
>
> class WebsiteUserAdmin( admin.ModelAdmin ):
>     list_display = ( 'username', )
>
> admin.site.register( WebsiteUser, WebsiteUserAdmin )
>
> When I view this, the admin list page correctly summarises "1 website
> user", however it has no rows.
>
> Any ideas?

Ideas? Yes: don't do that.
If you just want to override the admin for User, then unregister the
admin class for that model and re-register your own. Subclassing like
this is bound to lead to all sorts of issues.

admin.site.unregister(User)
admin.site.register(User, MyCustomUserAdmin)

Or if you really want to duplicate the user admin while leaving the
original one intact, look into setting up multiple Admin sites:
http://docs.djangoproject.com/en/dev/ref/contrib/admin/#adminsite-objects
--
DR.
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Admin screen counts correctly but returns no records

[JonUK]

I'm creating a new admin UI for User, separate to the standard admin
User interface - I have the following setup:

class WebsiteUser( User ):
class Meta:
db_table = 'auth_user'

class WebsiteUserAdmin( admin.ModelAdmin ):
list_display = ( 'username', )

admin.site.register( WebsiteUser, WebsiteUserAdmin )

When I view this, the admin list page correctly summarises "1 website
user", however it has no rows.

Any ideas?
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#7210 - F() Query Expressions

[Russell Keith-Magee]

Hi all,

With [9792], I've committed F() query expressions to trunk. For
details, see the docs:

http://docs.djangoproject.com/en/dev/topics/db/queries/#filters-can-reference-fields-on-the-model

There are two caveats worth knowing about:

1) This patch reveals a bug in the SQLite package that ships with
Ubuntu Intrepid Ibex (SQLite 3.5.9-3). Versions of SQLite 3.5.9 on
other operating systems (including Debian) don't appear to be
affected, and other versions of SQLite on Ubuntu don't appear to be
affected either.

2) F() expressions have not been updated to work with GIS fields.
However, based on some initial discussions with Justin, it should be
possible to make these changes without affecting any public API. If
anyone with access and experience with contrib.GIS cares to help out
on this front, assistance would be gratefully accepted; otherwise,
we'll just have to wait until Justin surfaces from his Bar exams.

Finally, some thank yous:

Sebastian Noack for getting the ball rolling. Sebastian raised the
original ticket and wrote the original patch. Not much of that patch
survived into the final implementation, but his contribution is very
much appreciated. Unfortunately, I forgot about Sebastian's original
involvement when I wrote the commit message - for that, I apologize.

Nicolas Lara for doing the heavy lifting as part of the 2008 Google
Summer of Code. F() expressions were an optional item in his GSoC
proposal, but he made such good progress on aggregates that we got
two-for-one. Nicolas, take a bow - you did some excellent work here.

Alex Gaynor provided some excellent assistance debugging and fixing a
number of problems as we neared completion of the project (including
narrowing down the mutant SQLite problem). Thanks Alex.

Malcolm Tredinnick did his usual stunning job at reviewing code and
picking holes in designs. Thanks Malcolm.

Thanks also to the many people that contributed ideas during the
design phase, and to those who tested the code as it was developing.
Your efforts may not have ended up in the final design or turned into
a bug report, but thanks for taking the time to look at an
experimental feature.

Yours,
Russ Magee %-)

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Re: @cache_control() and @never_cache not working

[Tomas Kopecek]

In that version (0.96) of Django was bug in combination of these
decorators and CacheMiddleware. If you can use upstream version then
everything will be working. Otherwise look for these (closed) tickets on
http://code.djangoproject.com and patch your version.

Tomas Kopecek

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Re: 'FtrToolTags' is not a valid tag library: Could not load template library from django.templatetags.FtrToolTags, cannot import name Product

[Thiago F. Crepaldi]

Well,

i figured it out. As i said before, i upgraded from django 0.97 (svn)
to 1.0.2 stable, BUT i didn't rebooted my server. So, when i looked at
META INFORMATION in my browser, i saw that 0.97 version still being
used, instead of the new version. I rebooted it and everything is
normal again. =)

pretty weird, ham ?!

Thanks all
Thiago.

On Jan 29, 8:23 am, "Thiago F. Crepaldi"  wrote:
> Hello,
>
> in my templates pages, i do: {% load FtrToolTags %}
>
> in my FtrToolTags, i do: from webTool.ftrTool.models import Product
>
> i also use Product model on admin.py, forms.py, views.py and models.py
>
> Thanks,
> Thiago
>
> On Jan 28, 11:21 pm, Malcolm Tredinnick 
> wrote:
>
> > On Wed, 2009-01-28 at 16:15 -0800, Thiago F. Crepaldi wrote:
> > > in models.py all the code is ok.
>
> > What other files are using the Product model? In particular, how do you
> > import it into the module(s) that are using it in template tags.
> > Something in your code is not importing Product or importing it
> > incorrectly. Find that place.
>
> > > Is there any procedure to "register"
> > > Product ?
>
> > No. It only has to be imported.
>
> > Regards,
> > Malcolm
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Re: Search in a ManyToManyField in Admin interface

[João Olavo Baião de Vasconcelos]

On Wed, Jan 28, 2009 at 7:36 PM, Ian  wrote:

> Yes, that's the problem.  The admin automatically adds .distinct() to  the
> queryset whenever one of the search fields is in a related model,  which
> would trigger the error.


Ok, got it.


> This is a limitation of Oracle, and there's not a whole lot we can do
> about it, other than to suggest you not structure your models that way.


But in my case, it gotta have a TextField.


>  Probably your best solution will be to put the TextField in a separate
> one-to-one related model.


I tried it, but it became awful. For instance, every time that I add a Book,
not only there's a list of all other descriptions already added, but also
I've to add it in a separated window. I'm more inclined to change to a mysql
db.

Thanks, Ian!
-- 
João Olavo Baião de Vasconcelos
Bacharel em Ciência da Computação
Analista de Sistemas - Infraestrutura
joaoolavo.wordpress.com

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Re: template: writing "\u20ac 20.000" fails

[SanPy]

Well, I thought it didn't escape the input string. I was wrong. I
tried `escape_js` again and now it works just fine. It probably did
before, but I don't remember why I thought it didn't.

Regards,
Sander

On 28 jan, 04:28, Malcolm Tredinnick  wrote:
> On Tue, 2009-01-27 at 00:37 -0800, SanPy wrote:
> > Thanks a lot, Malcolm,
>
> > You got me on the right track, I just needed to escape the string,
> > like this:
>
> > var prices=[{% for price in prices %}[{{ price.0 }}, '{{ price.1|
> > escape }}']{% if not forloop.last %},{% endif %}{% endfor %}];
>
> > I tried the `escapejs` filter. That didn't work.
>
> What does "didn't work" mean? It raised an error? Your computer caught
> on fire?
>
> The "escapejs" filter isn't broken and works quite well. The "escape"
> filter does HTML-aware escaping, not Javascript-aware escaping. They are
> different, so using the "escape" (of "force_escape") filter for data
> intended for Javascript will lead to incorrect results.
>
> Regards,
> Malcolm
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Re: 'FtrToolTags' is not a valid tag library: Could not load template library from django.templatetags.FtrToolTags, cannot import name Product

[Thiago F. Crepaldi]

Hello,

in my templates pages, i do: {% load FtrToolTags %}

in my FtrToolTags, i do: from webTool.ftrTool.models import Product

i also use Product model on admin.py, forms.py, views.py and models.py

Thanks,
Thiago

On Jan 28, 11:21 pm, Malcolm Tredinnick 
wrote:
> On Wed, 2009-01-28 at 16:15 -0800, Thiago F. Crepaldi wrote:
> > in models.py all the code is ok.
>
> What other files are using the Product model? In particular, how do you
> import it into the module(s) that are using it in template tags.
> Something in your code is not importing Product or importing it
> incorrectly. Find that place.
>
> > Is there any procedure to "register"
> > Product ?
>
> No. It only has to be imported.
>
> Regards,
> Malcolm
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Re: How to do Refbacks in Django?

[Fluoborate]

Oh wait, you told me that too:

MIDDLEWARE

Okay, I'm all set, thanks so much.
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Re: How to do Refbacks in Django?

[Fluoborate]

Yes, thank you, but I already figured that out and made a stupid
function add_to_log(request). What I am really wondering is, how do I
avoid having to call add_to_log(request) in every single view function
in views.py?

Thanks.

On Jan 28, 8:04 pm, Malcolm Tredinnick 
wrote:
> You have access to all the HTTP headers in the request object that is
> passed to your view. See [1] for details. Once you have that
> information, recording it somewhere via a middleware or something should
> be easy.
>
> [1]http://docs.djangoproject.com/en/dev/ref/request-response/#django.htt...
>
> Regards,
> Malcolm
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Re: pb synchronize database to django

[Daniel Roseman]

On Jan 29, 9:07 am, arbi  wrote:
> Hi,
>
> I am a newb in Django and I find it very nice... But the current
> problem is that, when I try to synchronize my models (using python
> manage.py syncdb), an attribute that I changed did not change in my
> database. For instance :
>
> class Route (models.Model) :
>     name=.
>     attribute 2
>     attribute 3
>     etc.
>
> that I change to :
>
> class Route (models.Model) :
>     newNameAttribute=.
>     attribute 2
>     attribute 3
>     etc.
>
> Then I run python manage.py syncdb, everything goes well in the
> shell,
> EXCEPT : no changings in my database.
> Then when I want to create an instance of Route I got a NameError :(
>
> Thanks for your help!

Please read the lovely documentation, especially the bit in the big
box here:
http://docs.djangoproject.com/en/dev/ref/django-admin/#syncdb

Then search the archives of this list for 'migrations'.
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pb synchronize database to django

[arbi]

Hi,

I am a newb in Django and I find it very nice... But the current
problem is that, when I try to synchronize my models (using python
manage.py syncdb), an attribute that I changed did not change in my
database. For instance :

class Route (models.Model) :
name=.
attribute 2
attribute 3
etc.


that I change to :

class Route (models.Model) :
newNameAttribute=.
attribute 2
attribute 3
etc.

Then I run python manage.py syncdb, everything goes well in the
shell,
EXCEPT : no changings in my database.
Then when I want to create an instance of Route I got a NameError :(

Thanks for your help!
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Re: can i use models like that??

[bruno desthuilliers]

On 28 jan, 23:09, Mirat Can Bayrak  wrote:
> Can you look at these, can they work?
>
> i tried that one but not worked, is there way to make it working? (nope, 
> there was no error messages, only strings are not shown at admin panel)
>
> LANGUAGE_OPTIONS = (('en_GB', '(British) English'), ('tr', 'Turkish'), ('es', 
> 'Spanish'))
> class ShortDescription(models.Model):
>     strings = dict()
>     product = models.ForeignKey(Product)
>     for language in LANGUAGE_OPTIONS:
>         strings[language[0]] = models.CharField(max_length=300)


Nope, this won't work - not that way at least. And I won't tell you
how this _could_ be made to work, because AFAICT, it's a a very wrong
design anyway. If what you want is to have per-language description of
a same product, better do it the right way (wrt/ the relational
model), that is using one record per product/language, ie:

LANGUAGE_OPTIONS = (('en_GB', '(British) English'), ('tr', 'Turkish'),
('es', 'Spanish'))

class ShortDescription(models.Model):
product = models.ForeignKey(Product)
language = models.CharField(choices=LANGUAGE_OPTIONS,
max_length=4)
text = models.TextField()

My 2 cents...
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Re: Creating test databases. Nose framework

[Oleg Oltar]

>
> Generally, you'll want to wait more than 6 hours before asking again. A
> couple of days, at least, would be a reasonable period.
>

Sorry...Will note
On Thu, Jan 29, 2009 at 2:54 AM, Malcolm Tredinnick <
malc...@pointy-stick.com> wrote:

>
> On Wed, 2009-01-28 at 17:19 +0200, Oleg Oltar wrote:
> >  Any idea?
>
> Generally, you'll want to wait more than 6 hours before asking again. A
> couple of days, at least, would be a reasonable period.
>
> > On Wed, Jan 28, 2009 at 11:41 AM, Oleg Oltar 
> > wrote:
> > Can't find how to add predefined data to the db. Sorry for
> > being silly, maybe someone can point me?
>
> Add it just like you normally add objects to the database. Create them
> in the test setup methods and save them. Or load them up with raw SQL.
>
> Regards,
> Malcolm
>
> >
>
>
> >
>

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