#8309: GenericForeignKey fails when used in abstract base models
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Reporter: Wonlay | Owner: msaelices
Status: assigned | Milestone: 1.0
Component: Contrib apps | Version: SVN
Resolution: | Keywords: GenericForeignKey , model
inheritance
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by msaelices):
Real problem is in this fragment of {{{django.db.base.ModelBase}}} class:
{{{
# The abstract base class case.
names = set([f.name for f in new_class._meta.local_fields
+ new_class._meta.many_to_many])
for field in base._meta.local_fields +
base._meta.local_many_to_many:
if field.name in names:
raise FieldError('Local field %r in class %r
clashes with field of similar name from abstract base class %r'
% (field.name, name, base.__name__))
new_class.add_to_class(field.name,
copy.deepcopy(field))
}}}
The problem is
{{{django.contrib.generic.GenericForeignKey.contribute_to_class}}} doesnt
call to {{{cls._meta.add_field(self)}}}, that insert field into
{{{base._meta.local_fields}}}.
But the thing is {{{GenericForeignKey}}} is not a real field... is a
virtual field. I'll try take a workaround that also implements a new
feature, for adding virtual fields thats follow inheritance.
--
Ticket URL: <http://code.djangoproject.com/ticket/8309#comment:8>
Django Code <http://code.djangoproject.com/>
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