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
26797	Reverse `related_name` of a proxy not accessible to inherited proxies	Maxime Lorant	nobody	"Taken the following example (not real world use case, but it is somewhat equivalent of something I encountered):

{{{
from django.db import models


class Animal(models.Model):
    name = models.CharField(""animal name"", max_length=255, blank=True, null=False)

class Mammal(Animal):
    class Meta:
        proxy = True

class Cat(Mammal):
    class Meta:
        proxy = True

class Dog(Mammal):
    class Meta:
        proxy = True

class TrueFriendship(models.Model):
    mammal = models.ForeignKey(Mammal, related_name=""dog_friends"")
    dog = models.ForeignKey(Dog, related_name=""mammal_friends"")
}}}

I want to get the number of friends of a queryset of cats. However, doing this in a shell results in an exception:


{{{
>>> from nature.models import *
>>> cat = Cat.objects.create(name=""cat1"")
>>> dog = Dog.objects.create(name=""dog1"")
>>> TrueFriendship.objects.create(cat=cat, dog=dog)
>>> Cat.objects.annotate(nb_dog_friends=models.Count('dog_friends'))
Traceback (most recent call last):
  File ""/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/manager.py"", line 122, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
[...]
  File ""/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/sql/query.py"", line 1330, in names_to_path
    ""Choices are: %s"" % (name, "", "".join(available)))
FieldError: Cannot resolve keyword 'dog_friends' into field. Choices are: id, name
}}}

(Full traceback attached in a file) However, the same query using the `Mammal` proxy works and the reverse relation is available on single object: 

{{{
>>> Mammal.objects.annotate(nb_dog_friends=models.Count('dog_friends')).first().nb_dog_friends
1
>>> Cat.objects.first().dog_friends.all()
[<TrueFriendship: TrueFriendship object>]
}}}

Something is inconsistent here: I would expect to have access to `dog_friends` in both cases (on a model instance and a queryset)"	Bug	new	Database layer (models, ORM)	1.9	Normal		related_name reverse relation		Unreviewed	0	0	0	0	0	0