Method delete

lib/sqlalchemy/orm/attributes.py:1333–1363

(self, state: InstanceState[Any], dict_: _InstanceDict)

    __slots__ = ()

    def delete(self, state: InstanceState[Any], dict_: _InstanceDict) -> None:
        if self.dispatch._active_history:
            old = self.get(
                state,
                dict_,
                passive=PASSIVE_ONLY_PERSISTENT
                | NO_AUTOFLUSH
                | LOAD_AGAINST_COMMITTED,
            )
        else:
            old = self.get(
                state,
                dict_,
                passive=PASSIVE_NO_FETCH ^ INIT_OK
                | LOAD_AGAINST_COMMITTED
                | NO_RAISE,
            )

        self.fire_remove_event(state, dict_, old, self._remove_token)

        existing = dict_.pop(self.key, NO_VALUE)

        # if the attribute is expired, we currently have no way to tell
        # that an object-attribute was expired vs. not loaded.   So
        # for this test, we look to see if the object has a DB identity.
        if (
            existing is NO_VALUE
            and old is not PASSIVE_NO_RESULT
            and state.key is None
        ):
            raise AttributeError("%s object does not have a value" % self)

    def get_history(
        self,