#16259 closed Cleanup/optimization (worksforme)
State more clearly that django.contrib.ccontenttypes depends on django.contrib.sites
Reported by: | Piotr Czachur | Owned by: | nobody |
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Component: | Documentation | Version: | dev |
Severity: | Normal | Keywords: | |
Cc: | Triage Stage: | Accepted | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
I don't have django.contrib.sites inside my installed apps, and despite that BaseDatabaseCreation.create_test_db() assumes that I have Site model which ends up with exception:
# BaseDatabaseCreation.create_test_db() from django.db.models import get_model Site = get_model('sites', 'Site') if Site is not None and Site.objects.using(self.connection.alias).count() == 1: Site.objects.using(self.connection.alias).update(id=settings.SITE_ID) Exception: django.db.utils.DatabaseError: relation "django_site" does not exist
Why get_model() returns Site instead of None, despite I don't have sites in my INSTALLED_APPS?
Because contenttypes (which I have in INSTALLED_APPS) does "from django.contrib.sites.models import get_current_site", and in that moment Site model gets registered.
/tmp/django/db/backends/creation.py(239)create_test_db() -> load_initial_data=False) /tmp/django/core/management/__init__.py(166)call_command() -> return klass.execute(*args, **defaults) /tmp/django/core/management/base.py(219)execute() -> self.validate() /tmp/django/core/management/base.py(243)validate() -> from django.core.management.validation import get_validation_errors /tmp/django/core/management/validation.py(3)<module>() -> from django.contrib.contenttypes.generic import GenericForeignKey, GenericRelation /tmp/django/contrib/contenttypes/generic.py(14)<module>() -> from django.contrib.admin.options import InlineModelAdmin, flatten_fieldsets /tmp/django/contrib/admin/__init__.py(6)<module>() -> from django.contrib.admin.sites import AdminSite, site /tmp/django/contrib/admin/sites.py(5)<module>() -> from django.contrib.admin.forms import AdminAuthenticationForm /tmp/django/contrib/admin/forms.py(4)<module>() -> from django.contrib.auth.forms import AuthenticationForm /tmp/django/contrib/auth/forms.py(4)<module>() -> from django.contrib.sites.models import get_current_site > /tmp/django/contrib/sites/models.py(6)<module>() -> ...
My final question is: is get_model() a good way to determine if some model is really "enabled" inside my project?
Maybe checking INSTALLED_APPS for application_name would be better solution.
Change History (3)
comment:1 by , 14 years ago
Component: | Testing framework → Documentation |
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Summary: | BaseDatabaseCreation.create_test_db() requires unexistant table. → State more clearly that django.contrib.ccontenttypes depends on django.contrib.sites |
Triage Stage: | Unreviewed → Accepted |
Type: | Bug → Cleanup/optimization |
comment:2 by , 14 years ago
Resolution: | → worksforme |
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Status: | new → closed |
I can't reproduce this. get_model does indeed return None if the app for a given model is not in INSTALLED_APPS. Further, contenttypes does not depend on sites. The documentation uses the site model as an example of a content type, nothing more.
>>> from django.conf import settings >>> 'django.contrib.sites' in settings.INSTALLED_APPS False >>> from django.db.models import get_model >>> print get_model('sites', 'Site') None
comment:3 by , 14 years ago
My apologies, it was fixed in r16053. I must have used outdated Django trunk.
The doc for
contenttypes
say that you must enablesites
too, but it's not very clear: https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#the-contenttype-modelI'm re-qualifying the ticket to improve this doc.
Generally, when app A uses models from app B, those models are "enabled" in your app, even if B is not in INSTALLED_APPS. When this happens, for the sake of clarity, you should add app B to your INSTALLED_APPS.