Миграция Django не выполняется для ForeignKey в пользовательскую модель

Question

Когда я запускаю миграцию для новой модели, имеющей ForeignKey, для пользовательской модели User, я получаю сообщение об ошибке:

ValueError: Lookup failed for model referenced by field test.TestModel.user: account.EmailUser

Это в Джанго 1.7.

Мой пользовательский пользователь apps.models.EmailUser,

Вот соответствующий код:

# apps.test/models.py
from django.db import models
from django.conf import settings


class TestModel(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL)

# settings.py

AUTH_USER_MODEL = 'account.EmailUser'
INSTALLED_APPS = (
    ...
    'apps.account',
    'apps.test',
)

Наконец, вот файл миграции:

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import models, migrations
from django.conf import settings


class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name='TestModel',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
            ],
            options={
            },
            bases=(models.Model,),
        ),
    ]

Полная трассировка ошибок

Running migrations:
  Applying test.0001_initial...Traceback (most recent call last):
  File "./manage.py", line 4, in <module>
    manage_environment()
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/bobsleigh/runner/__init__.py", line 9, in manage_environment
    execute_from_command_line(sys.argv)
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 160, in handle
    executor.migrate(targets, plan, fake=options.get("fake", False))
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 63, in migrate
    self.apply_migration(migration, fake=fake)
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 91, in apply_migration
    if self.detect_soft_applied(migration):
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 135, in detect_soft_applied
    apps = project_state.render()
  File "/home/david/.virtualenvs/lingoing/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 89, in render
    model=lookup_model,
ValueError: Lookup failed for model referenced by field test.TestModel.user: account.EmailUser

Дополнительная информация

Я заметил, что есть тест, чтобы увидеть, использует ли он собственную пользовательскую модель в django.db.migrations.state.render(), но он воспринимает этот тест всерьез, только если render вызывается с ignore_swappable=True, что не является в моем случае.

Любые идеи кто-нибудь?