id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
7716	select_related() with nullable ForeignKeys screws up when rows actually have a null value	miracle2k	Malcolm Tredinnick	"{{{
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'>
}}}"		closed	Database layer (models, ORM)	dev		fixed			Accepted	0	0	0	0	0	0