Re: django1.5 pour rapidsms

[Victor Rocha]

can you post the traceback you are getting?

On Wednesday, July 31, 2013 7:49:10 AM UTC-4, mimi89 wrote:
>
> depuis que j'ai rajouté l'application rapidsms-xforms à rapidsms, celui-ci 
> ne marche plus car la version de ce dernier est Django1.5 et que pour 
> rapidsms c'est un ancienne version!
> Les tags donnent un messages d'erreurs!
> Si quelqu'un peut m'aider!!!
>
>

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Looking for the right way to specialize the User model

[Paul Whipp]

I'm using Django 1.5 and I needed an api to control the addition of users 
and the management of users on those groups. Django's rest framework proved 
a good starting point but I hit issues with the ManyToMany relation groups 
which means that there is no model for the user_group which in turn 
complicated the API. I worked around this fairly easily with the following 
code:

from django.db import models
from django.contrib.auth.models import User, UserManager, Group

class UserGroup(models.Model):
user = models.ForeignKey(User)
group = models.ForeignKey(Group)
class Meta:
# auth_user_groups is created by the ManyToMany relation field
# in the contrib.auth.models User model
managed = False
db_table = 'auth_user_groups'

# Add an easy way to get at this from the User objects
def get_user_groups(self):
return UserGroup.objects.filter(user=self)
User.add_to_class('get_user_groups', get_user_groups)

This handles the problem by allowing the API to have convenient usergroup 
urls and endpoints but I don't like using 'add_to_class'. I really just 
want a specialized user class but I could not get the following to work:

class APIUser(User):
objects = UserManager()
class Meta:
managed = False
db_table = 'auth_user'

def get_user_groups(self):
return UserGroup.objects.filter(user=self)

Sadly, it fails with, for example, "Unknown column 'auth_user.user_ptr_id' 
in 'where clause'" if I try to save a newly created APIUser.

Am I barking up the wrong tree or just missing something obvious?


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Upgrading to 1.5 on Centos

[Larry Martell]

On my Mac, running python 2.7, I upgraded from 1.4 to 1.5 by doing this:

rm -rf /Library/Python/2.7/site-packages/django

Followed by python setup.py install in the dir I untar-ed Django-1.5.1
to. This all worked fine.


On a Centos system running python 2.6 I did:

rm -rf /usr/lib/python2.6/site-packages/django followed by the
setup.py install. My django app is working, and appears to be running
1.5, however anytime I use manage.py (for collectstatic or syncdb or
test, for example) I get these messages:

/usr/lib/python2.6/site-packages/django/core/management/__init__.py:465:
DeprecationWarning: The 'execute_manager' function is deprecated, you
likely need to update your 'manage.py'; please see the Django 1.4
release notes (https://docs.djangoproject.com/en/dev/releases/1.4/).
  DeprecationWarning)
/usr/lib/python2.6/site-packages/django/core/management/__init__.py:409:
DeprecationWarning: The 'setup_environ' function is deprecated, you
likely need to update your 'manage.py'; please see the Django 1.4
release notes (https://docs.djangoproject.com/en/dev/releases/1.4/).
  DeprecationWarning)

So it seems I still have some 1.4 stuff around. I don't get this on my
Mac. How can I get rid of these messages?

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Re: Using standard Django admin User forms for Custom User model?

[Russell Keith-Magee]

On Wed, Jul 31, 2013 at 12:36 PM, Victor Hooi  wrote:

> Hi,
>
> When you add a Django User through the admin, it presents you with a
> initial screen to enter a username and password  (/admin/auth/user/add/),
> and then handles hashing for you.
>
> Also, when you go to edit a User, it gives you a Change Password form
> (e.g. /admin/auth/user/2/password/)
>
> I'm using a custom user model in my Django app, by inheriting from
> AbstractCustomer.
>
> If I add this to the admin now, password is just a standard textbox, and
> obviously if I create a user through that, I can't login since I assume
> it's not hashing the password.
>
> Is there any way I can use the normal Django User admin forms with a
> custom User model?
>
> Secondly, I tried creating a user via the create_user() method on my
> custom User object - I still wasn't able to login to the admin using that
> username/password, which I thought was weird.
>

Have you read the documentation on this issue?

https://docs.djangoproject.com/en/1.5/topics/auth/customizing/#custom-users-and-the-built-in-auth-forms

The docs discuss what you have to do in order to get your User model
represented in the admin, and also provide a worked example.

If you've got a specific question that isn't covered by the docs, or if
you're confused by what the docs say, let us know.

Yours,
Russ Magee %-)

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Re: django jquery

[Robin Lery]

I was thinking about client communication via ajax and jquery, but also
interested in jquery ui. I am a django noob and also with ajax. So its very
confusing for me how to integrate these two. Can you please advice where to
start?
Thank you.


On Wed, Jul 31, 2013 at 9:54 PM, Jonathan Baker <
jonathandavidba...@gmail.com> wrote:

> You've posed a pretty open-ended question. Are you looking to provide an
> API using Django that then a client communicates with via Ajax using
> jQuery? Or are you interested in, say, using jQuery to manipulate the UI
> generated by Django templates? If you can be more specific in your goals,
> more direction can provided.
>
> Jonathan
>
>
> On Wed, Jul 31, 2013 at 10:14 AM, Robin Lery  wrote:
>
>> Hi,
>> Can any one please suggest good book or tutorials if possible regarding
>> django and ajax (jquiry). I looked at one book "Django JavaScript
>> Integration AJAX and jQuery", but it was very confusing and outdated as
>> well,  didn't help much.Please suggest tutorials or books with latest
>> version. Would be very thankful.
>>
>> Thank you.
>>
>> --
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>>
>>
>>
>
>
>
> --
> Jonathan D. Baker
> Developer
> http://jonathandbaker.com
>
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Re: Impossible? Django with NTLM SSO auth on windows?

[Andre Terra]

On Sun, Jul 7, 2013 at 5:01 PM, Yves Rausch  wrote:

> Hello guys,
>
> we had a similar issue and created a new module on apache 2.4 where you
> can use ntlm authentication on a windows machine.
> Here is the binary download and some information (including a link to
> github repository): http://www.informer.de/produkte/apache-sspi-ntlm/
> Hope this helps.
>

Excellent news! Congratulations on the achievement and thank you so much
for sharing this with us!


Best wishes,
AT

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Re: django jquery

[Jonathan Baker]

You've posed a pretty open-ended question. Are you looking to provide an
API using Django that then a client communicates with via Ajax using
jQuery? Or are you interested in, say, using jQuery to manipulate the UI
generated by Django templates? If you can be more specific in your goals,
more direction can provided.

Jonathan


On Wed, Jul 31, 2013 at 10:14 AM, Robin Lery  wrote:

> Hi,
> Can any one please suggest good book or tutorials if possible regarding
> django and ajax (jquiry). I looked at one book "Django JavaScript
> Integration AJAX and jQuery", but it was very confusing and outdated as
> well,  didn't help much.Please suggest tutorials or books with latest
> version. Would be very thankful.
>
> Thank you.
>
> --
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>
>
>



-- 
Jonathan D. Baker
Developer
http://jonathandbaker.com

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Re: pdf conversion error

[Harjot Mann]

On Wed, Jul 31, 2013 at 9:23 PM, Charly Román  wrote:
> You probably have in your view the decorator 'login_required' and you
> have defined de correct url of login whit LOGIN_URL in your settings.


Yeah..it was the problem. Thanks for your help but I already solved it
yesterday. Now its working fine. Thanks once again :)

-- 
Harjot Kaur Mann
Blog: http://harjotmann.wordpress.com/

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django jquery

[Robin Lery]

Hi,
Can any one please suggest good book or tutorials if possible regarding
django and ajax (jquiry). I looked at one book "Django JavaScript
Integration AJAX and jQuery", but it was very confusing and outdated as
well,  didn't help much.Please suggest tutorials or books with latest
version. Would be very thankful.

Thank you.

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Re: pdf conversion error

[Charly Román]

*haven't defined

2013/7/31 Charly Román :
> 2013/7/29 Harjot Mann :
>> I am trying to convert the html templates in my project from localhost
>> using wkhtltopdf. I used weasyprint and a script also but the getting
>> the same errror from all. It creates the pdf but inside this is
>> written:
>> Not Found
>> The requested URL /accounts/login/ was not found on this server.
>> Apache/2.2.22 (Ubuntu) Server at localhost Port 80
>>
>> What is its solution??
>>
>
> You probably have in your view the decorator 'login_required' and you
> have defined de correct url of login whit LOGIN_URL in your settings.

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Re: pdf conversion error

[Charly Román]

2013/7/29 Harjot Mann :
> I am trying to convert the html templates in my project from localhost
> using wkhtltopdf. I used weasyprint and a script also but the getting
> the same errror from all. It creates the pdf but inside this is
> written:
> Not Found
> The requested URL /accounts/login/ was not found on this server.
> Apache/2.2.22 (Ubuntu) Server at localhost Port 80
>
> What is its solution??
>

You probably have in your view the decorator 'login_required' and you
have defined de correct url of login whit LOGIN_URL in your settings.

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How to profile Django App?

[zweb]

I have a web page that is loading very slow.

It uses a Javascript tree grid component - data loaded via XML - XML 
generated by LXML - Django view - Django ORM - MYSQL DB.

I need to find out where is the performance bottleneck. It could be one or 
more of the above components.

What are the best tools - Free or Commercial which can help me profile this 
whole path? 




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Re: Remote Authentication and Session Management

[Bill Freeman]

Is this an inactivity timeout?  If so, you could perform an interaction
with the back end every time the user interacts with you, even if the
user's interaction doesn't require it, thereby extending the timeout just
as though the user was working directly.

Just performing an interaction periodicly to extend the timeout, despite
the lack of a user interaction, would be circumventing the back end's
security policy, not to be done lightly.  But accepting AJAX indications
that the user is actively paging through the data (detecting scrolling in
JavaScript, for example, or responding to a popup that says timeout is
coming) as a reason to perform a timeout extending interaction probably
doesn't violate the back end's policy.

If, instead, the timeout happens whether or not there has been recent
interaction, then it would be best to consider frequent re-authentication
to be the back end's policy, and pass that burden on to the user.

As far as managing the back end cookie goes, store it on the user's session
object.  Update it when it changes )or when it is handed to you, whether or
not it differs, the change is low cost).  There is no need to send it on to
the user's browser, which already gets the Django session key.

See:

  https://docs.djangoproject.com/en/dev/topics/http/sessions/


On Wed, Jul 31, 2013 at 8:29 AM,  wrote:

> I'm using Django to build a *frontend* application which will fetch data
> from a remote (RESTful, for the matter) API for presentation to users that
> can authenticate within the API. This API will, upon every successful
> login, output a *cookie* which I will need to use in further requests,
> and to this *cookie* will correspond a given (session) timeout (so that I
> will need to login again within the API to generate a new *cookie*). I
> was advised to stay away from storing usernames and passwords myself on the
> *frontend* side of the matters, so now I need to figure out how can I
> store this *cookie* upon and associate it with a *browser* session so
> that I can know if a given user is "authenticated" in view code. How do I
> go about accomplishing this?
>
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>
>

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Re: Learning how to build a web site for my python games and a blog

[Randy Baxley]

These are definitely good suggestions for going deeper in Python and C.  I 
am not real confident that the poll tutorial and vagrant are going to work 
for me though since my current sticking point is getting the NAME fielod to 
point to mydb.  It does something funny with the r hat which may be 
connected to my Xubunto being installed side by side with XP.

On Wednesday, July 31, 2013 5:22:52 AM UTC-5, Cal Leeming [Simplicity Media 
Ltd] wrote:
>
> Try this;
>
> http://learnpythonthehardway.org/book/next.html
> http://gettingstartedwithdjango.com/
>
> Cal
>
> On Tue, Jul 30, 2013 at 3:07 PM, Randy Baxley 
>  > wrote:
>
>> I am trying to learn Django.  I have a good base in Python having worked 
>> several basic MOOCs and second level classes.  My major short term goal is 
>> to build a web site where I will have a blog on smoked brisket in Chicago 
>> and a place to rewrite my games built in the Rice University course 
>> Interactive Python Programming from Coursera.  Here is the final program 
>> from that class.  The reason for a rewrite is these are written on 
>> CodeSkulptor.
>>
>> http://www.codeskulptor.org/#user16_nkeTb6O5Je_12.py
>>
>> Here you will find The Django Book written by *Adrian Holovaty who wrote 
>> Django.*
>> *
>> *
>> http://www.djangobook.com/en/2.0/frontmatter.html
>>
>> What I am wondering is if anyone else is working through it as well as I 
>> keep hitting road blocks and the answers I am getting here are not working 
>> for me in Xumbunto though that may not be the problem.  I have found that a 
>> group of folks working at the same time tend to hit on ideas in a fashion 
>> that is more to the point and on fb that it is easy to get back to the 
>> thread you want since there are not as many threads pertaining to other 
>> Django topics.
>>
>> I was also asking if there is another Django tutorial that might be at 
>> more of a beginner level? 
>>
>> On Saturday, July 27, 2013 8:57:45 AM UTC-5, Randy Baxley wrote:
>>>
>>> Is anyone working through The Django Book that would like to form a fb 
>>> page just for that or knows of a good tutorial where questions will get 
>>> answers?
>>>
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>>  
>>
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Remote Authentication and Session Management

[bruno]

I'm using Django to build a *frontend* application which will fetch data 
from a remote (RESTful, for the matter) API for presentation to users that 
can authenticate within the API. This API will, upon every successful 
login, output a *cookie* which I will need to use in further requests, and 
to this *cookie* will correspond a given (session) timeout (so that I will 
need to login again within the API to generate a new *cookie*). I was 
advised to stay away from storing usernames and passwords myself on the *
frontend* side of the matters, so now I need to figure out how can I store 
this *cookie* upon and associate it with a *browser* session so that I can 
know if a given user is "authenticated" in view code. How do I go about 
accomplishing this?

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Re: how to create a new table in existing app

[Mike Dewhirst]

On 31/07/2013 5:57pm, Mike Dewhirst wrote:

I just defined a new many-to-many relationship in an existing table then
manually defined the many-to-many table model.

Unfortunately, syncdb didn't/wouldn't create the table for me. No
errors, just no table!

Is there a trick to it?


Yes. Just needed a "through" mention and syncdb worked. Was able to to 
remove it later without consequences.




Is South the answer?


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What is the best way to architect this part of the application?

[Chris Ryan]

I thank you again for answering a different question a couple of weeks ago. 
Today, however, I'm struggling with the best way to architect a part of my 
app.  I'm hoping that you can help me figure out the best way to provide 
the necessary functionality to the user.


I am building an application that allows home school families the ability 
to register their children for upcoming classes.  This is a co-operative 
and so parents can be teachers, admins, etc. and there can be multiple 
children in each family.

You may find the following information familiar. I copied/pasted it from my 
earlier post. 

In my models.py file I have the following class definitions:


class Family(models.Model):

...

name = models.CharField(verbose_name="Family Name")





class FamilyMember(AbstractUser):



family = models.ForeignKey(Family, blank=True, null=True)
family_member_role = models.ForeignKey(FamilyMemberRole, blank=True, 
null=True)#For our example, let's assume this is either a parent or a 
child

...




class Student(models.Model):

...

family_member = models.OneToOneField(FamilyMember)

...



class Schedule(models.Model):

...

semester = models.ForeignKey(Semester, verbose_name='Semester')
student = models.ManyToManyField(Student, verbose_name='Students', 
 blank=True, null=True)

...



So, there is a table called Family that I belong to. It holds my family 
name and a couple of other fields.   

There is then a one-to-many relationship from that to the FamilyMember 
table. In this table I have a record for each member of my family.   

The FamilyMember table is also being used as the authentication table for 
my site. I have not replaced the default security model but only abstracted 
it and added additional fields.

My children are students so they are in the Student table. Of course, they 
are in the FamilyMember table with a foreign key in the Students table.

I am logged into the site as myself. Since my family_member_role is set to 
parent I should be able to enroll all of my children into their courses.

The Schedule table contains a bunch of relationships that "glue" together a 
course in a course catalog, a semester, a set of teachers, a set of 
assistants, a set of students, etc. I don't think that this this matters in 
my question but I wanted to mention it just in case.

*** There can be unlimited periods. For this semester, we might have 3 
periods but next semester we might have 4 or 5. So, I have a table that 
stores the periods for each semester.


On to my design question.

>From the user perspective, I'm thinking of the following workflow. However, 
I don't know if there is a better way to architect it.

A parent logs into the site.
She clicks on the "Schedule" link for a specific Semester.
She sees a list of classes that she can enroll her children in.   It is 
grouped by periods (first hour, second hour, etc) and it looks something 
like below. Note, the co-op only meets twice a month and does not replace 
any of the children's actual curriculum. These classes can be very 
educational but are really designed more for social interaction.

First Period
 Fun with math   (1st - 3rd grade)
 Spelling games (1st - 3rd grade)
 C++ programming (4th - 5th grade)
 Sing and dance (4th - 5th grade)

Second Period
 Science experiments (1st - 3rd grade)
 Computer games (1st - 3rd grade)
 Woodworking (4th - 5th grade)
 Public speaking (4th - 5th grade)

Now, as a parent, I need to enroll my two children into classes. I have a 
3rd grader and a 4th grader.  I am NOT forced to enroll my children in 
classes that match their grades. I can enroll my 3rd grade child in the C++ 
programming class if I think that he can succeed in that class. 

So, how do I set up this enrollment?   I have a couple of options that are 
floating around in my mind. The first option is to use the bootstrap 
accordian class (See OPTION 1 below). When a parent clicks on the "Fun with 
math" the list of their children are displayed as radio buttons. The parent 
can select either/or child.   Both children /could/ be enrolled in the same 
first period if desired. Let's say that Mark is selected in the Math class. 
  When the parent clicks on the "Spelling games" class, the same children 
list is displayed. If the parent selects Mark for this Spelling class, then 
the math class selection is cleared for Mark.   So, Mark can only be 
enrolled in one class during First Period. 

As the parent moves on to Second Period, she can enroll her children just 
like she did during first 

Re: Moving data in a browser.

[Bill Freeman]

Things that you want to do in the browser should probably be done in the
browser.  If so, then Django isn't directly involved, until you want to
persist the changes.

There are a number of JavaScript libraries that support dragging things
around a table.  Long ago I did something like this using, I think, YUI
(from yahoo), but I'm sure that tools have moved on since then.
Personally, I now try to stick to things that leverage jQuery and jQueryUI,
since I tend to load them anyway.

You almost certainly will be tweaking your templates to feed the JS the
information that it needs, though there may be libraries that can be
pointed at virtually any table.

If you're going to persist the changes without waiting for a submit button,
then you need to AJAX the ordering information back when it changes.  If
you only save later, you still want a library that makes it easy to extract
the current ordering.
Remember to do things with CSS when possible.  For example, hiding a table
column: Rather than traipse through all the th and td for that column,
setting display none, it is better to add/remove a class to the table tag
(or some outer element) that triggers a CSS rule making display none.  It
is surprisingly easy to trigger IE to pop up "A script is taking to long.
abort? continue?".



On Wed, Jul 31, 2013 at 5:25 AM, Nigel Legg  wrote:

> The attached screenshot, simpletab, shows the simple cross tab I have
> created using Django (my first functioning app).  This takes in a csv data
> file and an xml definition file. The user selects the variables they want
> to see, and the table is created.
> My question is that the user may want to flip the table round, or add new
> variables to the table.  I'd quite like to do this as a drag and drop
> thing, would I have to do this using javascript or something else?  I
> assume I can't use Django - am I wrong is thinking that?
> Any suggestions of how to do that gratefully received
> Thanks, N//
>
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django1.5 pour rapidsms

[mimi89]

depuis que j'ai rajouté l'application rapidsms-xforms à rapidsms, celui-ci 
ne marche plus car la version de ce dernier est Django1.5 et que pour 
rapidsms c'est un ancienne version!
Les tags donnent un messages d'erreurs!
Si quelqu'un peut m'aider!!!

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j'ai rajouté une application rapidsms-xforms à rapidsms et maintenant ça ne marche pasn car la version de django de ce dernier est django1.5 et celui de rapidsms est une ancienne version et ça ne marc

[mimi89]

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Re: Learning how to build a web site for my python games and a blog

[Cal Leeming [Simplicity Media Ltd]]

Try this;

http://learnpythonthehardway.org/book/next.html
http://gettingstartedwithdjango.com/

Cal

On Tue, Jul 30, 2013 at 3:07 PM, Randy Baxley wrote:

> I am trying to learn Django.  I have a good base in Python having worked
> several basic MOOCs and second level classes.  My major short term goal is
> to build a web site where I will have a blog on smoked brisket in Chicago
> and a place to rewrite my games built in the Rice University course
> Interactive Python Programming from Coursera.  Here is the final program
> from that class.  The reason for a rewrite is these are written on
> CodeSkulptor.
>
> http://www.codeskulptor.org/#user16_nkeTb6O5Je_12.py
>
> Here you will find The Django Book written by *Adrian Holovaty who wrote
> Django.*
> *
> *
> http://www.djangobook.com/en/2.0/frontmatter.html
>
> What I am wondering is if anyone else is working through it as well as I
> keep hitting road blocks and the answers I am getting here are not working
> for me in Xumbunto though that may not be the problem.  I have found that a
> group of folks working at the same time tend to hit on ideas in a fashion
> that is more to the point and on fb that it is easy to get back to the
> thread you want since there are not as many threads pertaining to other
> Django topics.
>
> I was also asking if there is another Django tutorial that might be at
> more of a beginner level?
>
> On Saturday, July 27, 2013 8:57:45 AM UTC-5, Randy Baxley wrote:
>>
>> Is anyone working through The Django Book that would like to form a fb
>> page just for that or knows of a good tutorial where questions will get
>> answers?
>>
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Moving data in a browser.

[Nigel Legg]

The attached screenshot, simpletab, shows the simple cross tab I have
created using Django (my first functioning app).  This takes in a csv data
file and an xml definition file. The user selects the variables they want
to see, and the table is created.
My question is that the user may want to flip the table round, or add new
variables to the table.  I'd quite like to do this as a drag and drop
thing, would I have to do this using javascript or something else?  I
assume I can't use Django - am I wrong is thinking that?
Any suggestions of how to do that gratefully received
Thanks, N//

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<>

Re: many-to-many between apps

[Mike Dewhirst]

On 31/07/2013 5:08pm, Mike Dewhirst wrote:

Is it possible to establish a many-to-many relationship between a model
in one app and a model in another app?


Yes. I needed to avoid importing the class and use ...

class Region(models.Model):
  ... various fields ...
  ref = models.ManyToManyField('item.Reference')

Lovely!

Thanks for Django



I've just tried to do it and run into what I think is circular import
trouble. This is a retro-fit after initial deployment.

#in item.models.reference
class Reference(models.Model):
 ... various fields ...
 class Meta:
 app_label = 'item'

#in item.models.reference_region
from company import Region

class Reference_Region(models.Model):
 region = models.ForeignKey(Region)
 reference = models.ForeignKey(Reference)
 class Meta:
 app_label = 'item'


#in company.models.region
from item import Reference

class Region(models.Model):
 ... various fields ...
 ref = models.ManyToManyField(Reference)

I have tried it the other way declaring the many-to-many field in
Reference and the same thing happens.

ImportError: cannot import name Reference
and
ImportError: cannot import name Region
respectively

Any ideas appreciated

Thanks

Mike



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many-to-many between apps

[Mike Dewhirst]

Is it possible to establish a many-to-many relationship between a model 
in one app and a model in another app?


I've just tried to do it and run into what I think is circular import 
trouble. This is a retro-fit after initial deployment.


#in item.models.reference
class Reference(models.Model):
... various fields ...
class Meta:
app_label = 'item'

#in item.models.reference_region
from company import Region

class Reference_Region(models.Model):
region = models.ForeignKey(Region)
reference = models.ForeignKey(Reference)
class Meta:
app_label = 'item'


#in company.models.region
from item import Reference

class Region(models.Model):
... various fields ...
ref = models.ManyToManyField(Reference)

I have tried it the other way declaring the many-to-many field in 
Reference and the same thing happens.


ImportError: cannot import name Reference
and
ImportError: cannot import name Region
respectively

Any ideas appreciated

Thanks

Mike

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Re: .filter() and .exclude() don't add up

[akaariai]

On Tuesday, July 30, 2013 6:26:47 PM UTC+3, Daniele Procida wrote:
>
> On Mon, Jul 29, 2013, akaariai  wrote: 
>
> >> I understood that part. But by "more general" I mean one that will work 
> >> for any case, without having to know where the Nulls might be. 
> >> 
> >> So given queryset A, and its subset queryset B, we can place B against 
> A 
> >> and obtain its complement. 
> >> 
> >> Or to put it another way: give me all the items in A that are not in B. 
> >> 
> > 
> >You can do this with a subquery in Django. non_red_things = 
> >queryset.exclude(pk__in=red_things). If this performs well is a different 
> >thing. 
>
> It seems to take about twice as long to execute, so no, it doesn't perform 
> very well. 
>
> >I think that in SQL one can use WHERE (original_condition) is not true; 
> >which will match both unknown (null comparison's result) and false in the 
> >original condition. 
>
> But this isn't available as a Django query, without using raw SQL? 
>
>  
No it isn't. Writing a patch that adds QuerySet.negate() operation would be 
fairly straightforward. If such an operation will be accepted to Django is 
a different question. In my opinion the main question is if queries written 
as "WHERE (original_condition) is not true" will perform well enough. If 
not, then adding the operation isn't a good idea, but if it generally 
performs well, then addition of it seems like a good idea to me.

 - Anssi

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