#26401: Allow auth machinery to be used without installing auth app
     Reporter:  Matt Johnson         |                    Owner:  Andrew
                                     |  Konoff
         Type:  Bug                  |                   Status:  closed
    Component:  contrib.auth         |                  Version:  1.9
     Severity:  Normal               |               Resolution:  fixed
     Keywords:  auth                 |             Triage Stage:  Ready for
                                     |  checkin
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0

Comment (by Jon Dufresne):

 I've hit another snag with the `MIGRATION_MODULES = {'auth': None}`
 approach. (Sorry, is it better to reopen this ticket or file a new one?)

 The `auth.Permission` model has a fk on `ContentType`. Due to this, when
 deleting a `ContentType` (such as with the `remove_stale_contenttypes`
 command) queries against the missing `auth_permission` table can occur.

 Not sure how best to handle this scenario. IIUC, as long as auth is in
 `INSTALLED_APPS`, the models will be loaded and this FK will cause an

 Here is a stack trace when deleting a stale content type

 Traceback (most recent call last):
   File "/usr/lib64/python3.5/runpy.py", line 170, in _run_module_as_main
     "__main__", mod_spec)
   File "/usr/lib64/python3.5/runpy.py", line 85, in _run_code
     exec(code, run_globals)
   File "/home/jon/devel/django/django/__main__.py", line 9, in <module>
   File "/home/jon/devel/django/django/core/management/__init__.py", line
 366, in execute_from_command_line
   File "/home/jon/devel/django/django/core/management/__init__.py", line
 358, in execute
   File "/home/jon/devel/django/django/core/management/base.py", line 294,
 in run_from_argv
     self.execute(*args, **cmd_options)
   File "/home/jon/devel/django/django/core/management/base.py", line 345,
 in execute
     output = self.handle(*args, **options)
 line 46, in handle
   File "/home/jon/devel/django/django/db/models/deletion.py", line 218, in
     elif sub_objs:
   File "/home/jon/devel/django/django/db/models/query.py", line 260, in
   File "/home/jon/devel/django/django/db/models/query.py", line 1072, in
     self._result_cache = list(self.iterator())
   File "/home/jon/devel/django/django/db/models/query.py", line 54, in
     results = compiler.execute_sql()
   File "/home/jon/devel/django/django/db/models/sql/compiler.py", line
 847, in execute_sql
     cursor.execute(sql, params)
   File "/home/jon/devel/django/django/db/backends/utils.py", line 64, in
     return self.cursor.execute(sql, params)
   File "/home/jon/devel/django/django/db/utils.py", line 94, in __exit__
     six.reraise(dj_exc_type, dj_exc_value, traceback)
   File "/home/jon/devel/django/django/utils/six.py", line 685, in reraise
     raise value.with_traceback(tb)
   File "/home/jon/devel/django/django/db/backends/utils.py", line 64, in
     return self.cursor.execute(sql, params)
   File "/home/jon/devel/django/django/db/backends/sqlite3/base.py", line
 334, in execute
     return Database.Cursor.execute(self, query, params)
 django.db.utils.OperationalError: no such table: auth_permission

Ticket URL: <https://code.djangoproject.com/ticket/26401#comment:19>
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