Method process_saves

lib/sqlalchemy/orm/dependency.py:582–614

(self, uowcommit, states)

                    # if the old parent wasn't deleted but child was moved.

    def process_saves(self, uowcommit, states):
        should_null_fks = (
            not self.cascade.delete_orphan
            and not self.passive_deletes == "all"
        )

        for state in states:
            history = uowcommit.get_attribute_history(
                state, self.key, attributes.PASSIVE_NO_INITIALIZE
            )
            if history:
                for child in history.added:
                    self._synchronize(
                        state, child, None, False, uowcommit, False
                    )
                    if child is not None and self.post_update:
                        self._post_update(child, uowcommit, [state])

                for child in history.deleted:
                    if (
                        should_null_fks
                        and not self.cascade.delete_orphan
                        and not self.hasparent(child)
                    ):
                        self._synchronize(
                            state, child, None, True, uowcommit, False
                        )

                if self._pks_changed(uowcommit, state):
                    for child in history.unchanged:
                        self._synchronize(
                            state, child, None, False, uowcommit, True
                        )

    def _synchronize(
        self, state, child, associationrow, clearkeys, uowcommit, pks_changed