ImportError at /admin/logout/
I'm getting an ImportError at /admin/logout/
Traceback:
File "/home/mrmelve/dev/python-local/django/core/handlers/base.py" in get_response
82. response = callback(request, *callback_args, **callback_kwargs)
File "/home/mrmelve/dev/python-local/django/contrib/admin/sites.py" in root
113. return self.logout(request)
File "/home/mrmelve/dev/python-local/django/contrib/admin/sites.py" in logout
197. from django.contrib.auth.views import logout
File "/home/mrmelve/dev/python-local/django/contrib/auth/views.py" in <module>
1. from django.contrib.auth.forms import AuthenticationForm
File "/home/mrmelve/dev/python-local/django/contrib/auth/forms.py" in <module>
1. from django.contrib.auth.models import User
File "/home/mrmelve/dev/python-local/django/contrib/auth/models.py" in <module>
369. from django.contrib.auth import admin
File "/home/mrmelve/dev/python-local/django/contrib/auth/admin.py" in <module>
1. from django.contrib.auth.forms import UserCreationForm
Exception Type: ImportError at /admin/logout/
Exception Value: cannot import name UserCreationForm
This looks like a circular import problem in contrib.auth.admin.
From the traceback, importing User imports admin which imports UserCreationForm which imports User again.
Oddly, I haven't experienced this error using the development server, but only when running under mod_python. Also, the problem is somewhat intermittent in that sometimes the logout completes without a problem, but most of the time triggers the import error.
I've attached a patch which avoids the problem by moving the import of UserCreationForm from the top level into the add_view method.
I believe this error is due to an AlreadyRegistered exception and it will be fixed when that is handled differently. That being said if it is the AlreadyRegistered exception, this patch is really not the way to fix it. Also, I am only able to duplicate this in mod_python; in the runserver environment it doesn't seem to through the error. I think that this error and some other odd AlreadyRegistered errors are due to the way mod_python handles imports.