#8892: ForeignKey relation not saved as expected
------------------------------+---------------------------------------------
Reporter: julien | Owner: nobody
Status: new | Milestone:
Component: Database wrapper | Version: 1.0
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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Here are two simple models:
{{{
class ModelA(models.Model):
name = models.CharField(max_length=10)
class ModelB(models.Model):
name = models.CharField(max_length=10)
a = models.ForeignKey(ModelA, blank=True, null=True)
}}}
Now, see the following sequence. When setting the relation *before* saving
the related object, the relation itself is not properly saved:
{{{
>>> a = ModelA(name='foo')
>>> b = ModelB(name='bar')
>>> b.a = a # Set relation *before* saving related object
>>> a.save() # Save related object
>>> b.save()
>>> b.a
<ModelA: ModelA object>
>>> b = ModelB.objects.get(name='bar')
>>> b.a
<NoneType: None>
}}}
Logically I'd expect that, since `a` is saved before `b`, the relation
would be properly saved but it is not.
Yet, if setting the relation *after* saving the related object, then it
works fine (in the below example I only swapped 2 lines: `b.a = a` and
`a.save()`):
{{{
>>> a = ModelA(name='foo')
>>> b = ModelB(name='bar')
>>> a.save() # Save related object
>>> b.a = a # Set relation *after* saving related object
>>> b.save()
>>> b.a
<ModelA: ModelA object>
>>> b = ModelB.objects.get(name='bar')
>>> b.a
<ModelA: ModelA object>
}}}
I've tested with MySQL and SQLite.
--
Ticket URL: <http://code.djangoproject.com/ticket/8892>
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