Method detached_to_persistent

lib/sqlalchemy/orm/events.py:2235–2267

Intercept the "detached to persistent" transition for a specific object. This event is a specialization of the :meth:`.SessionEvents.after_attach` event which is only invoked for this specific transition. It is invoked typically during the :meth:`.Session.ad

(self, session: Session, instance: _O)

    @_lifecycle_event
    def detached_to_persistent(self, session: Session, instance: _O) -> None:
        """Intercept the "detached to persistent" transition for a specific
        object.

        This event is a specialization of the
        :meth:`.SessionEvents.after_attach` event which is only invoked
        for this specific transition.  It is invoked typically during the
        :meth:`.Session.add` call, as well as during the
        :meth:`.Session.delete` call if the object was not previously
        associated with the
        :class:`.Session` (note that an object marked as "deleted" remains
        in the "persistent" state until the flush proceeds).

        .. note::

            If the object becomes persistent as part of a call to
            :meth:`.Session.delete`, the object is **not** yet marked as
            deleted when this event is called.  To detect deleted objects,
            check the ``deleted`` flag sent to the
            :meth:`.SessionEvents.persistent_to_detached` to event after the
            flush proceeds, or check the :attr:`.Session.deleted` collection
            within the :meth:`.SessionEvents.before_flush` event if deleted
            objects need to be intercepted before the flush.

        :param session: target :class:`.Session`

        :param instance: the ORM-mapped instance being operated upon.

        .. seealso::

            :ref:`session_lifecycle_events`

        """

    @_lifecycle_event
    def loaded_as_persistent(self, session: Session, instance: _O) -> None: