谁知道我做错了什么吗
我有注册事件的方法(更新前,删除后,插入前) https://github.com/ITCase/sqlalchemy_mptt/blob/b0efead7a8ee5acc063b68ee3bfc756af4689d6e/sqlalchemy_mptt/mixins.py#L69
@classmethod
def register_tree(cls):
event.listen(cls, "before_insert", cls.mptt_before_insert)
event.listen(cls, "after_delete", cls.mptt_after_delete)
event.listen(cls, "before_update", cls.mptt_before_update)
当我注册事件并尝试删除行(https://github.com/ITCase/sqlalchemy_mptt/blob/b0efead7a8ee5acc063b68ee3bfc756af4689d6e/sqlalchemy_mptt/tests.py#L104)时。在
^{pr2}$在更新方法之前调用,而不是在删除后调用。但是,如果我在更新事件(https://github.com/ITCase/sqlalchemy_mptt/blob/b0efead7a8ee5acc063b68ee3bfc756af4689d6e/sqlalchemy_mptt/mixins.py#L72)之前进行注释,就可以了。在
@classmethod
def register_tree(cls):
event.listen(cls, "before_insert", cls.mptt_before_insert)
event.listen(cls, "after_delete", cls.mptt_after_delete)
# event.listen(cls, "before_update", cls.mptt_before_update) <-- IF comment this, called after_delete method. It's OK.
生成状态https://travis-ci.org/ITCase/sqlalchemy_mptt/builds/23428309
怎么了?在
在那里求解https://groups.google.com/forum/#!msg/sqlalchemy/gdwuMjNfrPc/v2ChQjGjWwoJ
结果是,当删除带有子节点的节点时,sqlalchemy默认情况下首先更新子节点(设置parent_id=None),然后删除节点。当我设置cascade=“all,delete”时,它是逐个删除节点(不带更新)。在
相关问题 更多 >
编程相关推荐