Re: Obscure error installing Django

[Julio César Carrascal Urquijo]

I've tracked it down to something similar to this:
http://code.djangoproject.com/ticket/5530#comment:1

The ImportError that is been raised on
http://code.djangoproject.com/browser/django/trunk/django/db/backends/mysql/base.py#L20
is causing the session error. It probably should be changed also to a
raise ImproperlyConfigured so the error is reported correctly: For
some reason the FastCGI process was using the outdated version the
server has instead of 1.2.2 that I had installed (even though it is on
sys.path).

Thanks for your help.



On Nov 1, 1:40 am, Malcolm Tredinnick <[EMAIL PROTECTED]>
wrote:
> On Thu, 2007-11-01 at 04:50 +0000, Julio César Carrascal Urquijo wrote:
>
>
>
> > I'm installing Django on a shared hosting account but I've been
> > fighting the las two hours with this error:
>
> >  /home//django_src/django/contrib/sessions/middleware.py in
> > process_request(self= > object>, request=,
> > POST:<QueryDic...gi.url_scheme': 'http', 'wsgi.version': (1, 0)}>)
> >13 engine = __import__(settings.SESSION_ENGINE, {}, {},
> > [''])
> >14 session_key =
> > request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
> >15 request.session = engine.SessionStore(session_key)
> >16
> >17 def process_response(self, request, response):
> > request = ,
> > POST:<QueryDic...gi.url_scheme': 'http', 'wsgi.version': (1, 0)}>,
> > request.session undefined, engine =  > 'django.contrib.sessions.backends.db' fr...ngo_src/django/contrib/
> > sessions/backends/db.pyc'>, engine.SessionStore undefined, session_key
> > = None
>
> > AttributeError: 'module' object has no attribute 'SessionStore'
> >   args = ("'module' object has no attribute 'SessionStore'",)
>
> > It's probably something I missed because It goes away if I disable the
> > session middleware (that means I can't use auth or admin apps) so at
> > least the core of Django is working.
>
> > I took a look at the values of settings.SESSION_ENGINE and engine:
>
> > * settings.SESSION_ENGINE was 'django.contrib.sessions.backends.db'
> > * engine.__file__ was '/home//django_src/django/contrib/sessions/
> > backends/db.pyc'
>
> > which seems correct, but...
>
> > * dir(engine) was ['__builtins__', '__doc__', '__file__', '__name__',
> > 'settings']
>
> > ... an empty module. Anyone knows why this might be happening?
>
> I have no suggestions to offer here. I can't repeat this using Python
> 2.3 and latest subversion trunk (as you're using). I don't have
> mod_fastcgi set up for testing, though, so it might be something special
> going on there, but I can't imagine what it would be.
>
> If you run the same commands from the "manage.py shell" prompt, does it
> work? That is, do something like
>
> >>> from django.conf import settings
> >>> engine = __import__(settings.SESSION_ENGINE, {}, {},[''])
> >>> dir(engine)
>
> That should show more than you saw above. If it doesn't, I'm back to
> being stuff, because I don't know what's going on. If there are
> differences, your checkout is incomplete somehow.
>
> Regards,
> Malcolm
>
> --
> I don't have a solution, but I admire your 
> problem.http://www.pointy-stick.com/blog/


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Re: Obscure error installing Django

[Julio César Carrascal Urquijo]

I'm sorry. I'm using:

1) Python 2.3, Django from SVN and django-admin.py reports 0.97-pre-
SVN-6635.

2) Subversion checkout on an empty folder.

3) It's running through FCGI (mod_fcgi) and a new user just for Django
so I don't think it is another installation.

Thanks

On Oct 31, 11:57 pm, Malcolm Tredinnick <[EMAIL PROTECTED]>
wrote:
> On Thu, 2007-11-01 at 04:50 +0000, Julio César Carrascal Urquijo wrote:
>
> > I'm installing Django on a shared hosting account but I've been
> > fighting the las two hours with this error:
>
> Before going any further, you're going to have to say:
>
> (1) Which version of Django? In particular, what does "django-admin.py
> --version"report?
>
> (2) How did you install it? Over the top of an older installation (if
> so, remove all *.pyc files)?
>
> (3) Are there any other installations of Django on the machine? If so,
> have you confirmed that you're running against the correct installation?
>
> Regards,
> Malcolm
>
> --
> Plan to be spontaneous - tomorrow.http://www.pointy-stick.com/blog/


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Obscure error installing Django

[Julio César Carrascal Urquijo]

I'm installing Django on a shared hosting account but I've been
fighting the las two hours with this error:

 /home//django_src/django/contrib/sessions/middleware.py in
process_request(self=, request=,
POST:)
   13 engine = __import__(settings.SESSION_ENGINE, {}, {},
[''])
   14 session_key =
request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
   15 request.session = engine.SessionStore(session_key)
   16
   17 def process_response(self, request, response):
request = ,
POST:,
request.session undefined, engine = , engine.SessionStore undefined, session_key
= None

AttributeError: 'module' object has no attribute 'SessionStore'
  args = ("'module' object has no attribute 'SessionStore'",)

It's probably something I missed because It goes away if I disable the
session middleware (that means I can't use auth or admin apps) so at
least the core of Django is working.

I took a look at the values of settings.SESSION_ENGINE and engine:

* settings.SESSION_ENGINE was 'django.contrib.sessions.backends.db'
* engine.__file__ was '/home//django_src/django/contrib/sessions/
backends/db.pyc'

which seems correct, but...

* dir(engine) was ['__builtins__', '__doc__', '__file__', '__name__',
'settings']

... an empty module. Anyone knows why this might be happening?

Thanks


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Re: Directed graph implementations for Django

[Julio César Carrascal Urquijo]

I'm a newbie on Django my self but maybe this is what you are looking
for:

class Category(models.Model):
code = models.CharField(maxlength=200, unique=True)
products = models.ManyToManyField('Product')

class Product(models.Model):
parent = models.ForeignKey('Post')
code = models.CharField(maxlength=200, unique=True)

I've also read that you can specify signals for most operations on a
model (Like when a model is inserted, updated or deleted from the
database) though I can't find the URL right now. There's some mention
of it here:

http://www.djangoproject.com/documentation/db-api/


On Sep 16, 9:54 pm, "Paul Dorman" <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> definite newbie here. I'd like to implement a category type system in
> Django. I've looked in the cookbook and Googled a bit, but to no avail. What
> I'm after should be pretty simple: a directed graph for categories, where
> objects and perhaps categories can be a member of one or more categories.
> For example, a 'server' is an 'infrastructure component' (for the techies),
> as well as an 'asset' (for the financial types). In my grand scheme when an
> object is associated with one or more categories (one is the minimum), the
> application will  execute method calls stored (with optional parameters) in
> the database (serialized as JSON or XML). With the 'server' example, it
> might be that being in the 'infrastructure component' category triggers an
> email to be sent to the system administrator, and the existence in the
> 'asset' category would trigger an automated update to the asset register.
> The methods are stored according to the standard CRUD set of operations, so
> that a user can create a new category in the view, and then specify actions
> which occur when an object is created, read, updated, or deleted (provided
> by the application itself). Actions are triggered for both objects (the
> things that are categorized) and for child categories (so for example it may
> be that a parent category can be locked in such a way as to prevent any more
> child categories from being added).
>
> Note that categories are purely containers with generic actions (for crud
> operations on objects in the category) and distinct from objects, which I
> imagine would have a category_id FK. And note also that my objects are all
> using the same model, with the bulk of data serialized as XML.
>
> Has anyone out there in Djangoland done something like this? The graph's the
> thing - I'm happy to deal with the CRUD triggers myself. If there's a model
> out there that would be a good starting point that would be great.
>
> One additional thing I'm wondering about is how Django can work with stored
> procedures. For example, it might be more efficient if the application can
> ask the database for the methods to run  when an object is created,  and
> have the database return the methods for not only the object's bottom-level
> category, but for all parent categories as well.
>
> P.S.
>
> Congratulations on the great sprint!
>
> P.P.S. I hope I haven't just embarrassed myself with my naïveté.
>
> --
> "Science fiction writers are the only ones who care about the future"
> --  Kurt Vonnegut


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Efficient way to import many-to-many relations

[Julio César Carrascal Urquijo]

I have the following models (Well, very simplified):

class Category(models.Model):
code = models.CharField(maxlength=200, unique=True)
posts = models.ManyToManyField('Post')

class Product(models.Model):
parent = models.ForeignKey('Post')
code = models.CharField(maxlength=200, unique=True)

Now, I have a large file with products that I need to import and each
record has a list of categories that need to be associated with the
product:

def import_from_file(filename):
...
for r in product_records(file):
p = Product()
p.code = r['code']
p.parent = Product.get(code = r['parent_code'])
...
p.save()
for category in r['category_codes']:
c = Category.get(code = category)
c.posts.add(p)

This sort of works but it is too inefficient to import all products.
What I really like to do is something along the lines of:

cursor.execute("""insert into store_product (code, parent_id, ...)
select %s, id as parent_id, ...
from store_product
where code = %s""", r['code'] r['parent_code'])

and

cursor.execute("""insert into store_category_products (product_id,
category_id)
select %s, id as category_id, ...
from store_category
where code in (%s)""", p.id, r['category_codes'])

Is possible to express this within the django db-api or should I just
give up and use raw cursors?

Thanks


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Re: Accessing db_table in _pre_save()

[Julio César Carrascal Urquijo]

That's it. Thanks.


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Accessing db_table in _pre_save()

[Julio César Carrascal Urquijo]

I'm using a cursor inside the _pre_save() method for one of my models
and figured it would be wise to use the table name gerated by Django
instead of just hard-coding the name.

Is it possible to access the table name of a model from one of it's
methods?

Thanks.


(I'm using Django 0.95, btw)


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Using django models on external scripts.

[Julio César Carrascal Urquijo]

Hi.

I would like to use django models on external scripts to
initialize/modify the database. Is it possible?

I've followed the instructions of the tutorial (set
DJANGO_SETTINGS_MODULE='website.settings' and importing
website.settings works on python shell) but haven't been able to get it
to work with this simple script:

from models import Format
[f.save() for f in (
Format(order= 1, name='One'),
Format(order= 2, name='Two'),
)]

Executing "initialize.py" on the command line always shows the error:
EnvironmentError: Could not import settings ''website.settings'' (is it
on sys.path?): No module named 'website.settings'. (Yes, it is on
sys.path).

and if I try to import the script under manage.py shell it shows:
AttributeError: 'Format' object has no attribute 'id'.

I'm using the latest Magic Removal Branch on Windows XP and Python
2.4.3.

Thanks


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