#24282: Cannot Modify Foreign Keys Within Data Migrations
---------------------------------+-----------------------
Reporter: jeffasinger | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.8alpha1
Severity: Release blocker | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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The following data migration works in 1.7, but fails in 1.8a1
{{{
def forwards(apps, schema_editor):
A = apps.get_model('app_name', 'A')
B = apps.get_model('app_name', 'B')
a = A.objects.create()
b = B(a=a)
}}}
Fails with:
{{{
ValueError: Cannot assign "<A: A object>": "B.a" must be a "A"
instance.
}}}
I believe that this is because the model classes returned `apps.get_model`
aren't necessarily instances of the right type.
I'd be happy to create a failing test case, however, I'm new to the
project, and would like a little direction on where that should go.
--
Ticket URL: <https://code.djangoproject.com/ticket/24282>
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