#28988: Multi-table inheritance breaks GenericRelation querying
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Reporter: robwa | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.11
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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Minimal example to reproduce. Create two models:
{{{
#!python
class Generic(models.Model):
content_type = models.ForeignKey('contenttypes.ContentType')
object_id = models.PositiveIntegerField()
obj = GenericForeignKey()
class Vehicle(models.Model):
associations = GenericRelation('Generic',
related_query_name='vehicles')
}}}
Create a `Vehicle` and a `Generic` object pointing to the `Vehicle`. The
following query returns the expected result:
{{{
In [2]: Generic.objects.filter(vehicles__id=1)
Out[2]: <QuerySet [<Generic: Generic object>]>
}}}
Add a third model. Don't change any data. Now the query returns an empty
query set:
{{{
#!python
class Bike(Vehicle):
pass
}}}
{{{
In [2]: Generic.objects.filter(vehicles__id=1)
Out[2]: <QuerySet []>
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/28988>
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