Admin's NestedObjects doesn't support related_name with %(app_label)s or %(class)s.

[loic84]

Traceback (most recent call last):
  File "/Users/loic/Dev/django/tests/admin_util/tests.py", line 90, in test_relation_on_abstract
    n.collect([Contributor.objects.first()])
  File "/Users/loic/Dev/django/django/contrib/admin/utils.py", line 176, in collect
    return super(NestedObjects, self).collect(objs, source_attr=source_attr, **kwargs)
  File "/Users/loic/Dev/django/django/db/models/deletion.py", line 199, in collect
    field.rel.on_delete(self, field, sub_objs, self.using)
  File "/Users/loic/Dev/django/django/db/models/deletion.py", line 17, in CASCADE
    source_attr=field.name, nullable=field.null)
  File "/Users/loic/Dev/django/django/contrib/admin/utils.py", line 176, in collect
    return super(NestedObjects, self).collect(objs, source_attr=source_attr, **kwargs)
  File "/Users/loic/Dev/django/django/db/models/deletion.py", line 187, in collect
    reverse_dependency=True)
  File "/Users/loic/Dev/django/django/contrib/admin/utils.py", line 171, in collect
    self.add_edge(getattr(obj, related_name), obj)
AttributeError: 'Contributor' object has no attribute 'contributor_%(app_label)s_%(class)s'

[loic84]

PR ​https://github.com/django/django/pull/2193

[jeremb]

I can confirm this solves the problem I was having.

[Baptiste Mispelon]

Fixed in c3fdeb28fff35573bf86ef04b234c7f5817b0dea.