'Check that querysets obey the router for db suggestions'

def test_db_selection(self):

    self.assertEqual(Book.objects.db, u'other')
    self.assertEqual(Book.objects.all().db, u'other')
    self.assertEqual(Book.objects.using(u'default').db, u'default')
    self.assertEqual(Book.objects.db_manager(u'default').db, u'default')
    self.assertEqual(Book.objects.db_manager(u'default').all().db, u'default')
