#7716: select_related() with nullable ForeignKeys screws up when rows actually
have a null value
------------------------------+---------------------------------------------
Reporter: miracle2k | Owner: nobody
Status: new | Milestone:
Component: Database wrapper | Version: SVN
Keywords: | Stage: Unreviewed
Has_patch: 0 |
------------------------------+---------------------------------------------
{{{
class Review(models.Model):
author = models.ForeignKey(Person, blank=True, null=True)
}}}
{{{
>>> Review.objects.filter(author__isnull=True)[0].author
None
>>>
Review.objects.select_related('author').filter(author__isnull=True)[0].author
<type 'exceptions.TypeError'>: coercing to Unicode: need string or buffer,
NoneType found
>>> r =
Review.objects.select_related('author').filter(author__isnull=True)[0]
>>> type(r.author)
<class 'proj.app.models.person.Person'>
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/7716>
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