Query for ForeignKey using implicit exact and to_field breaks

[Jeremy Dunck]

Given these models:

class District(models.Model, models.GeoMixin):
    tea_number = models.CharField(maxlength=20, unique=True)

class School(models.Model, models.GeoMixin):
    district = models.ForeignKey(District, to_field='tea_number')

I expect this to work:

a_district = District.objects.all()[0]
Schools.objects.filter(district=a_district)

So that a_district's tea_nuumber attribute is used for the criteria against the School table rather than the District's PK.

django.db.models.query.lookup_inner (line 1082) has the bug:

                # RelatedObject is from a 1-1 relation,
                # No need to join; get the pk value from the related object,
                # and compare using that.
                column = current_opts.pk.name

I'll try to work up a patch for it. Tired now.

[James Bennett]

Duplicate of #4088.