test_signal_handlers.py 文件源码

def test_m2m_changed_post_clear_reverse(self):
        m2m_changed.disconnect(m2m_changed_handler, dispatch_uid='chemtrails.signals.handlers.m2m_changed_handler')
        m2m_changed.connect(m2m_changed_handler, dispatch_uid='m2m_changed_handler.test')
        try:
            book = BookFixture(Book, generate_m2m={'authors': (1, 1)}).create_one()
            self.assertEqual(1, len(get_node_class_for_model(Book).nodes.has(authors=True)))

            author = book.authors.get()
            author.book_set.clear()
            self.assertEqual(0, len(get_node_class_for_model(Book).nodes.has(authors=True)))
            self.assertEqual(0, len(get_node_class_for_model(Author).nodes.has(book_set=True)))
        finally:
            m2m_changed.connect(m2m_changed_handler, dispatch_uid='chemtrails.signals.handlers.m2m_changed_handler')
            m2m_changed.disconnect(m2m_changed_handler, dispatch_uid='m2m_changed_handler.test')