#14283: AttributeError on admin detail page after r13708
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Reporter: rene.p...@repro-mayr.de | Owner: nobody
Status: new | Milestone:
Component: Uncategorized | Version: 1.2
Resolution: | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by rene.p...@repro-mayr.de):
I have spent some more time tracking down this problem. Here is what I
have found out.
There are three model classes involved:
* Model A, no fields required
* Model B, no fields required
* Model C, with a generic foreign key and a regular foreign key to model
B
And there are also two admin classes involved:
* ModelCInline, a !GenericTabularInline for model C
* ModelAAdmin, which includes ModelCInline
* In addition, model B must be registered with the admin site, but does
not need any special options
When I try to add or change instances of model A on the admin site, I get
an !AttributeError with the following traceback:
{{{
Environment:
Request Method: GET
Request URL: http://localhost:8000/admin/testapp/modela/add/
Django Version: 1.3 pre-alpha SVN-13865
Python Version: 2.7.0
Installed Applications:
['django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.admin',
'testcase14283.testapp']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware')
Traceback:
File "/Users/rpuls/Library/Python/django/core/handlers/base.py" in
get_response
100. response = callback(request, *callback_args,
**callback_kwargs)
File "/Users/rpuls/Library/Python/django/contrib/admin/options.py" in
wrapper
245. return self.admin_site.admin_view(view)(*args,
**kwargs)
File "/Users/rpuls/Library/Python/django/utils/decorators.py" in
_wrapped_view
76. response = view_func(request, *args, **kwargs)
File "/Users/rpuls/Library/Python/django/views/decorators/cache.py" in
_wrapped_view_func
78. response = view_func(request, *args, **kwargs)
File "/Users/rpuls/Library/Python/django/contrib/admin/sites.py" in inner
190. return view(request, *args, **kwargs)
File "/Users/rpuls/Library/Python/django/utils/decorators.py" in _wrapper
21. return decorator(bound_func)(*args, **kwargs)
File "/Users/rpuls/Library/Python/django/utils/decorators.py" in
_wrapped_view
76. response = view_func(request, *args, **kwargs)
File "/Users/rpuls/Library/Python/django/utils/decorators.py" in
bound_func
17. return func(self, *args2, **kwargs2)
File "/Users/rpuls/Library/Python/django/db/transaction.py" in
_commit_on_success
299. res = func(*args, **kw)
File "/Users/rpuls/Library/Python/django/contrib/admin/options.py" in
add_view
822. self.inline_instances):
File "/Users/rpuls/Library/Python/django/contrib/admin/options.py" in
get_formsets
421. yield inline.get_formset(request, obj)
File "/Users/rpuls/Library/Python/django/contrib/contenttypes/generic.py"
in get_formset
403. return generic_inlineformset_factory(self.model,
**defaults)
File "/Users/rpuls/Library/Python/django/contrib/contenttypes/generic.py"
in generic_inlineformset_factory
369. fields=fields, exclude=exclude,
max_num=max_num)
File "/Users/rpuls/Library/Python/django/forms/models.py" in
modelformset_factory
685. formfield_callback=formfield_callback)
File "/Users/rpuls/Library/Python/django/forms/models.py" in
modelform_factory
423. return ModelFormMetaclass(class_name, (form,),
form_class_attrs)
File "/Users/rpuls/Library/Python/django/forms/models.py" in __new__
227. opts.exclude, opts.widgets,
formfield_callback)
File "/Users/rpuls/Library/Python/django/forms/models.py" in
fields_for_model
185. formfield = formfield_callback(f, **kwargs)
File "/Users/rpuls/Library/Python/django/contrib/admin/options.py" in
formfield_for_dbfield
113.
related_modeladmin.has_add_permission(request))
File "/Users/rpuls/Library/Python/django/contrib/admin/options.py" in
has_add_permission
292. return request.user.has_perm(opts.app_label + '.' +
opts.get_add_permission())
Exception Type: AttributeError at /admin/testapp/modela/add/
Exception Value: 'NoneType' object has no attribute 'user'
}}}
One interesting thing is that the error goes away as soon as I remove the
line that registers model B with the admin site.
For a minimal test case, you can use the attached project, which is
basically just a models.py:
{{{
#!python
import django.db.models as dj_models
import django.contrib.admin as dj_admin
import django.contrib.contenttypes.models as dj_ct_models
import django.contrib.contenttypes.generic as dj_generic
# model classes
class ModelC(dj_models.Model):
relation_b = dj_models.ForeignKey('ModelB')
tagged_object = dj_generic.GenericForeignKey()
content_type = dj_models.ForeignKey(dj_ct_models.ContentType)
object_id = dj_models.PositiveIntegerField()
class ModelA(dj_models.Model):
pass
class ModelB(dj_models.Model):
pass
# admin classes
class ModelCInline(dj_generic.GenericTabularInline):
model = ModelC
class ModelAAdmin(dj_admin.ModelAdmin):
inlines = [ModelCInline]
dj_admin.site.register(ModelA, ModelAAdmin)
# remove the following line to make the error go away
dj_admin.site.register(ModelB)
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/14283#comment:2>
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