id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
11920	Cannot access related field of an unsaved object if the object is from an inherited model	zbyte64		"See the code below:

{{{
#!python
from django.test import TestCase
from django.db import models

class Parent(models.Model):
    pass

class Child(Parent):
    pass

class Sibling(models.Model):
    child = models.ForeignKey(Child)

class BaseLine(models.Model):
    parent = models.ForeignKey(Parent)

class RelTest(TestCase):
    def test_relation(self):
        child = Child()
        child.save()
        assert child.sibling_set, 'This will pass'
        parent = Parent()
        parent.save()
        assert parent.baseline_set, 'This will pass'
        new_parent = Parent()
        assert parent.baseline_set, 'This will pass'
        new_child = Child()
        assert new_child.sibling_set, 'This will cause an exception'
}}}

{{{
Traceback (most recent call last):
  File ""/home/zbyte/Projects/bugs/bug/tests.py"", line 27, in test_relation
    assert new_child.sibling_set, 'This will cause an exception'
  File ""/usr/local/lib/python2.6/dist-packages/django/db/models/fields/related.py"", line 324, in __get__
    self.related.model._default_manager.__class__)
  File ""/usr/local/lib/python2.6/dist-packages/django/db/models/fields/related.py"", line 399, in create_manager
    getattr(instance, attname)}
  File ""/usr/local/lib/python2.6/dist-packages/django/db/models/fields/related.py"", line 244, in __get__
    raise self.field.rel.to.DoesNotExist
DoesNotExist
}}}

As you can see this is only an issue if the model is inherited from another model. It should either return a None() queryset or this exception should be consistently raised in the other instance."	Bug	closed	Database layer (models, ORM)	1.1	Normal	fixed	related field doesnotexist	jp@… david@…	Accepted	0	0	0	0	0	0