[Django] #23008: Migrations depending on django.contrib.auth with custom User model fail

[Django]

#23008: Migrations depending on django.contrib.auth with custom User model fail
---------------------------------+----------------------
     Reporter:  semenov          |      Owner:  nobody
         Type:  Uncategorized    |     Status:  new
    Component:  Migrations       |    Version:  1.7-rc-1
     Severity:  Release blocker  |   Keywords:
 Triage Stage:  Unreviewed       |  Has patch:  0
Easy pickings:  0                |      UI/UX:  0
---------------------------------+----------------------
 Steps to reproduce:
 1. Create a new project and the new app `accounts`
 2. Create the model `accounts.User`:
 {{{#!python
 from django.contrib.auth import models as auth_models
 from django.db import models

 class User(auth_models.AbstractBaseUser, auth_models.PermissionsMixin):
         name = models.CharField(max_length=255, unique=True)
         USERNAME_FIELD = 'name'
 }}}
 3. Edit settings.py and set `AUTH_USER_MODEL = 'accounts.User'`
 4. Run `manage.py makemigrations accounts`. It will crash:
 {{{
 ...
   File
 "/Users/semenov/work/migrtest/venv/src/django/django/db/migrations/graph.py",
 line 42, in add_dependency
     raise KeyError("Dependency references nonexistent parent node %r" %
 (parent,))
 KeyError: u"Dependency references nonexistent parent node (u'auth',
 u'__last__')"
 }}}

 This started to happen 2 days ago, I bisected the cause to
 aba75e73db6a0baca1b721698ca24f026bb4a745 (the fix for #22970). Previously,
 the migration dependencies were set to `[('auth', '__first__')]` which
 worked fine. (I realize that `__last__` makes more sense, so this is not
 about reverting the fix but rather making `__last__` to work on
 `django.contrib.auth.migrations`.)

-- 
Ticket URL: <https://code.djangoproject.com/ticket/23008>
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