id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27084	Admin site does not listen to database routers when adding objects	Jibodeah	nobody	"== Steps to reproduce ==

1. Use django-admin to start a new project. `django-admin startproject bugtest`
2. In bugtest/settings.py rename the 'default' entry in DATABASES to 'foobar'
    a. (also add a dummy 'default' entry which is an empty dict)


{{{
#!python
DATABASES = {
    'default': {},
    'foobar': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}
}}}


3. Run migrations on foobar. `./manage.py migrate --database foobar`
4. Add a router that unconditionally maps read and write to foobar.


{{{
#!python
import threading

class Router(object):
    def db_for_read(self, model, **hints):
        database = 'foobar'
        print(""Told thread {} to use {}"".format(threading.get_ident(), database))
        return database
    
    def db_for_write(self, model, **hints):
        return self.db_for_read(model, **hints)
}}}


5. Create a superuser on foobar. `./manage.py createsuperuse --database foobar`
6. Run the server and navigate to /admin, login with the superuser.
7. Click on any 'add' link to be taken to any page to add a instance of a model.

== Expected Results ==

The page for adding an instance of a model shows up and can be used to add models to the foobar database.

== Actual Results ==
The following error is raised:

{{{
Traceback (most recent call last):
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/core/handlers/exception.py"", line 39, in inner
    response = get_response(request)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/core/handlers/base.py"", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/core/handlers/base.py"", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/contrib/admin/options.py"", line 544, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/utils/decorators.py"", line 149, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/views/decorators/cache.py"", line 57, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/contrib/admin/sites.py"", line 211, in inner
    return view(request, *args, **kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/contrib/admin/options.py"", line 1509, in add_view
    return self.changeform_view(request, None, form_url, extra_context)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/utils/decorators.py"", line 67, in _wrapper
    return bound_func(*args, **kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/utils/decorators.py"", line 149, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/utils/decorators.py"", line 63, in bound_func
    return func.__get__(self, type(self))(*args2, **kwargs2)
  File ""/usr/lib64/python3.5/contextlib.py"", line 29, in inner
    with self._recreate_cm():
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/db/transaction.py"", line 158, in __enter__
    if not connection.get_autocommit():
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/db/backends/base/base.py"", line 365, in get_autocommit
    self.ensure_connection()
  File ""/home/jibodeah/.virtualenvs/test/lib/python3.5/site-packages/django/db/backends/dummy/base.py"", line 21, in complain
    raise ImproperlyConfigured(""settings.DATABASES is improperly configured. ""
django.core.exceptions.ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.
}}}

Implying that the admin site is trying to use the `default` database, ignoring the router's suggestion."	Bug	closed	contrib.admin	1.10	Normal	duplicate	admin, database, router		Unreviewed	0	0	0	0	0	0