#32851: GenericRelation inherited from Abstract model in different app fails to
generate migration
-----------------------------------------+------------------------
Reporter: foucdeg | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 2.2
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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I'm trying to create a new model in a new app B, inheriting from an
abstract model in app A:
{{{
# app_b/models.py
from app_a.models import Foo
class ConcreteModel(Foo):
pass
}}}
`Foo` has a GenericRelation to another model of app A:
{{{
# app_a/models.py
from django.contrib.contenttypes.fields import GenericRelation
class Foo(models.Model):
class Meta:
abstract = True
some_relation = GenericRelation(
"Bar",
content_type_field="foo_type",
object_id_field="foo_id"
)
class Bar(models.Model):
# whatever
}}}
Generation of the initial migration of app B fails with the following
SystemCheck errors:
{{{
<function
GenericRelation.contribute_to_class.<locals>.make_generic_foreign_order_accessors
at 0x7fa2a6747c80>: (models.E022) <function
GenericRelation.contribute_to_class.<locals>.make_generic_foreign_order_accessors
at 0x7fa2a6747c80> contains a lazy reference to app_b.bar, but app 'app_b'
doesn't provide model 'bar'.
app_b.ConcreteModel.some_relation: (fields.E307) The field
app_b.ConcreteModel.some_relation was declared with a lazy reference to
'app_b.bar', but app 'app_b' doesn't provide model 'bar'.
}}}
Indeed, app_b does not provide Bar, app_a does.
I tried explicitly mentioning app_a in the GenericRelation:
{{{
some_relation = GenericRelation(
"app_a.Bar",
content_type_field="foo_type",
object_id_field="foo_id"
)
}}}
but this does not generate a migration for app_a, nor does it fix the
problem.
--
Ticket URL: <https://code.djangoproject.com/ticket/32851>
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