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
27285	Multi-db example : default database config can not be an empty dict	Jose M Herrero	nobody	"I have  the same problem as ticket #26955 that is closed, to reproduce with nothing interfering I started a fresh project, these are the steps to reproduce:

1. Start a new DJango 1.10.1 project with `django-admin startproject mysite` and cd into it `cd mysite`
2. Create a database router `mysite/dbrouter.py`
{{{
#!div style=""font-size: 80%""
Code highlighting:
  {{{#!python
class DbRouter(object):
    def db_for_read(self, model, **hints):
        return 'master'

    def db_for_write(self, model, **hints):
        return 'master'

    def allow_relation(self, obj1, obj2, **hints):
        return True

    def allow_migrate(self, db, app_label, model_name=None, **hints):
        return True
   }}}
}}}

3. Edit `mysite.settings.py` as doc says with empty default and set the database router

{{{
#!div style=""font-size: 80%""
Code highlighting:
  {{{#!python
DATABASES = {
    'default': {},
    'master': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    },
}
DATABASE_ROUTERS = ['mysite.dbrouter.DbRouter']
}}}
}}}

4. Create `mysite/tests.py`
{{{
#!div style=""font-size: 80%""
Code highlighting:
  {{{#!python
from django.test import TestCase

class SurveyFormTest(TestCase):
    def test_sample(self):
        print 'hello'
}}}
}}}
5. Execute the tests and bang! `python manage.py test mysite`

{{{
Creating test database for alias 'master'...
hello
.E
======================================================================
ERROR: test_sample (mysite.tests.SurveyFormTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/test/testcases.py"", line 216, in __call__
    self._post_teardown()
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/test/testcases.py"", line 908, in _post_teardown
    self._fixture_teardown()
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/test/testcases.py"", line 1060, in _fixture_teardown
    return super(TestCase, self)._fixture_teardown()
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/test/testcases.py"", line 943, in _fixture_teardown
    inhibit_post_migrate=inhibit_post_migrate)
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 130, in call_command
    return command.execute(*args, **defaults)
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/core/management/base.py"", line 345, in execute
    output = self.handle(*args, **options)
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/core/management/commands/flush.py"", line 54, in handle
    allow_cascade=allow_cascade)
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/core/management/sql.py"", line 15, in sql_flush
    tables = connection.introspection.django_table_names(only_existing=True, include_views=False)
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/db/backends/base/introspection.py"", line 88, in django_table_names
    existing_tables = self.table_names(include_views=include_views)
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/db/backends/base/introspection.py"", line 55, in table_names
    with self.connection.cursor() as cursor:
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/db/backends/base/base.py"", line 233, in cursor
    cursor = self.make_cursor(self._cursor())
  File ""/home/chemary/workspace/myvirtualenv/local/lib/python2.7/site-packages/django/db/backends/dummy/base.py"", line 21, in complain
    raise ImproperlyConfigured(""settings.DATABASES is improperly configured. ""
ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.

----------------------------------------------------------------------
Ran 1 test in 0.002s

FAILED (errors=1)
Destroying test database for alias 'master'...
}}}
"	Uncategorized	new	Documentation	1.10	Normal		multi-db dbrouter		Unreviewed	0	0	0	0	0	0