#9546: GenericForeignKey + model inheritance: uses wrong content type
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Reporter: miracle2k | Owner: nobody
Status: new | Milestone:
Component: Contrib apps | Version: 1.0
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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{{{
class Link(models.Model):
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey(ct_field="content_type",
fk_field="object_id")
class Base(models.Model):
links = GenericRelation(Link)
class Sub(Base): pass
}}}
{{{
>>> link = Link()
>>> link.content_type = sub_instance
>>> link.save() # saves with "sub" content type
>>> sub_instance.links.all() # queries with "base" content type
[]
>>> sub_instance.base_ptr.links.all() # queries with "base" content type
[]
}}}
The expected result would contain the Link object just created, presumably
in both cases, but at least in the first. Either GenericForeignKey should
use the parent class content type, or GenericRelation uses the content
type of the model it is accessed through.
There may be additional complexities involved when using multiple model
inheritance, but I can't quite wrap my head around those so far.
--
Ticket URL: <http://code.djangoproject.com/ticket/9546>
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