'FK reverse relations are represented by managers, and can be controlled like managers'

def test_foreign_key_managers(self):

    marty = Person.objects.using('other').create(pk=1, name='Marty    Alchin')
    pro = Book.objects.using('other').create(pk=1, title='Pro    Django', published=datetime.date(2008, 12, 16), editor=marty)
    self.assertEquals(marty.edited.db, 'other')
    self.assertEquals(marty.edited.db_manager('default').db, 'default')
    self.assertEquals(marty.edited.db_manager('default').all().db, 'default')
