It is generally up to the code calling the rule to make sure that the object exists on the session at the expected key.

通常，调用规则的代码需要确保会话中存在对应于预期键的对象。

youdao

It is generally up to the code calling the rule to make sure that the object exists on the session at the expected key.

通常，调用规则的代码需要确保会话中存在对应于预期键的对象。

youdao