On Fri, 2006-07-28 at 12:57 -0700, Akatemik wrote:
> I got errors when user.get_profile returned None in my view. When
> trying the same in manage.py shell, I noticed that get_model doesn't
> find my profile model unless I have imported something from that
> models.py
>
> $ python manage.py shell
> Python 2.3.5 (#2, Jun 13 2006, 23:12:55)
> [GCC 4.1.2 20060613 (prerelease) (Debian 4.1.1-4)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> (InteractiveConsole)
> >>> from django.db import models
> >>> print models.get_model('kirjasto', 'LibraryProfile')
> None
> >>> from teekkarikyla.kirjasto.models import Loan # Can be any model in that
> >>> models
> >>> print models.get_model('kirjasto', 'LibraryProfile')
> <class 'teekkarikyla.kirjasto.models.LibraryProfile'>
>
> Seems liek get_model is either unreliable way to find models, or I'm
> missing something.
A mixture of both: The get_model() call does not populate the global
application/model cache. This is because it would introduce infinite
recursive descent into ModelBase.__new__ as implemented at the moment.
Normally this is not a problem, because the first time you import any
class that is *inherited* from models.Model (not models.Model itself),
the cache is populated. get_model() is reliable and well-behaved, but a
little unintuitive.
I am going to commit a change shortly that fixes the behaviour to be
more intuitive. I am in the process of testing the fix at the moment
(but am about to get interrupted by a lunch reception). If I can
convince myself it is completely stable and no risk, I'll commit it
today. Otherwise it will wait until after 0.95, because this area of the
code is a little tricky to debug in all the different paths -- many of
the bugs are hardware / OS / Python version dependent, so it's difficult
to regression test.
The current work around is to call models.get_apps() before the call to
get_model() and to just ignore the response. That forces the app and
model caches to be populated.
Regards,
Malcolm
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