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
28175	__in query on parent model no longer works in 1.11	Daniel Keller	nobody	"I have models

{{{
class Place(models.Model):
    pass

class Community(Place):
    place_ptr = models.OneToOneField(Place, parent_link=True, on_delete=models.CASCADE,
        primary_key=True, serialize=False, related_name='+')

class Potential(models.Model):
    community = models.ForeignKey(Community, on_delete=CASCADE)
}}}

and in 1.10 I can do
{{{
Potential.objects.filter(community__in=Place.objects.all())
}}}

but in 1.11 this fails with
{{{
django.core.exceptions.FieldError: Cannot resolve keyword 'place_ptr' into field. Choices are: [...]
}}}

In both versions
{{{
Potential.objects.filter(community=Place.objects.first())
}}}
works fine.

It's not clear to me from the docs whether the 1.10 behavior was intended, though.

It appears that adding the lines
{{{
                elif getattr(self.lhs.field.target_field, 'primary_key', False):
                    target_field = 'pk'
}}}
to django/db/models/fields/related_lookups.py at line 92 fixes this problem."	Bug	closed	Database layer (models, ORM)	1.11	Release blocker	fixed		Mariusz Felisiak Simon Charette	Accepted	1	0	0	0	0	0