'Check that querysets obey the router for db suggestions'

def test_db_selection(self):

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