#12240: select_related doesn't work correctly when mixing nullable and
non-nullable
keys
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Reporter: embe | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: 1.1
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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The following models:
{{{
class Model1(models.Model):
x = models.ForeignKey('Model2', null=True)
class Model2(models.Model):
y = models.ForeignKey('Model3', null=False)
class Model3(models.Model):
z = models.ForeignKey('Model4', null=False)
class Model4(models.Model):
q = models.IntegerField()
}}}
cause a problem with select_related():
{{{
In [4]: models.Model1.objects.select_related('x__y')
Out[4]: [<Model1: Model1 object>]
In [5]: models.Model1.objects.select_related('x__y__z')
Out[5]: []
}}}
It look like the fix for #7369 only fixed a case when a single non-
nullable ForeignKey is encountered, not when there are two in a row.
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Ticket URL: <http://code.djangoproject.com/ticket/12240>
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