#13781: select_related and multiple inheritance
-------------------------------------+-------------------------------------
Reporter: shauncutts | Owner: nobody
Type: Bug | Status: reopened
Component: Database layer | Version: 1.2
(models, ORM) | Resolution:
Severity: Normal | Triage Stage: Accepted
Keywords: | Needs documentation: 0
Has patch: 0 | Patch needs improvement: 0
Needs tests: 0 | UI/UX: 0
Easy pickings: 0 |
-------------------------------------+-------------------------------------
Comment (by ungenio):
I've created a couple tests. The version with select_related fails, and
the version without doesn't.
Description: If Child1 has a OneToOneField to Parent1 and if Child1 is a
subclass of Parent2, doing Parent1.objects.select_related('child1') will
produce this traceback:
{{{
======================================================================
ERROR: test_subclass_with_select_related
(modeltests.select_related.tests.SelectRelatedTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/Users/david/Projects/django-
trunk/tests/modeltests/select_related/tests.py", line 171, in
test_subclass_with_select_related
p = Parent1.objects.select_related('child1').get(name="Parent1")
File "/Users/david/Projects/django-trunk/django/db/models/query.py",
line 361, in get
num = len(clone)
File "/Users/david/Projects/django-trunk/django/db/models/query.py",
line 85, in __len__
self._result_cache = list(self.iterator())
File "/Users/david/Projects/django-trunk/django/db/models/query.py",
line 294, in iterator
offset=len(aggregate_select))
File "/Users/david/Projects/django-trunk/django/db/models/query.py",
line 1420, in get_cached_row
setattr(rel_obj, rel_field.attname, getattr(obj, rel_field.attname))
AttributeError: 'Parent1' object has no attribute 'subname'
----------------------------------------------------------------------
}}}
The same issue occurs if you subclass from both Parent1 and Parent2, but I
wanted to demonstrate that there is still a problem with just a single
subclass.
--
Ticket URL: <https://code.djangoproject.com/ticket/13781#comment:10>
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