Django 1.5.9 - DisallowedModelAdminToField for M2N Through Object

admin.py

from django.contrib import admin

from barbaz.models import A, Through


class ThroughInline(admin.TabularInline):
    model = Through
    fk_name = 'a1'
    raw_id_fields = ['a2']


class AAdmin(admin.ModelAdmin):
    inlines = [ThroughInline]


admin.site.register(A, AAdmin)

gistfile1.txt

The exception happens when clicking on the raw_id_fields magnifying glass in the admin, the popup will show the exception.

models.py

from django.db import models


class A(models.Model):
    bs = models.ManyToManyField('self', symmetrical=False, through='Through')


class Through(models.Model):
    a1 = models.ForeignKey(A, related_name='a1_set')
    a2 = models.ForeignKey(A, related_name='a2_set')

Traceback

Traceback:
File "/tmp/env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  113.                         response = callback(request, *callback_args, **callback_kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper
  390.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  89.         response = view_func(request, *args, **kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner
  202.             return view(request, *args, **kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
  25.             return bound_func(*args, **kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/tmp/env/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
  21.                 return func(self, *args2, **kwargs2)
File "/tmp/env/lib/python2.7/site-packages/django/contrib/admin/options.py" in changelist_view
  1198.                 self)
File "/tmp/env/lib/python2.7/site-packages/django/contrib/admin/views/main.py" in __init__
  64.             raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)

Exception Type: DisallowedModelAdminToField at /admin/barbaz/a/
Exception Value: The field id cannot be referenced.

Never mind; you guys fixed it in 1.5.12, so we just upgraded to that instead. SCIENCE.