#4957: Query for ForeignKey using implicit exact and to_field breaks
---------------------------------+------------------------------------------
Reporter: jdunck | Owner: adrian
Status: new | Component: Core framework
Version: SVN | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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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.
--
Ticket URL: <http://code.djangoproject.com/ticket/4957>
Django Code <http://code.djangoproject.com/>
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