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Classe « SessionEvents »

Méthode sqlalchemy.orm.SessionEvents.pending_to_transient

Signature de la méthode pending_to_transient

def pending_to_transient(self, session: 'Session', instance: '_O') -> 'None' 

Description

help(SessionEvents.pending_to_transient)

Intercept the "pending to transient" transition for a specific
object.

.. container:: event_signatures

     Example argument forms::

        from sqlalchemy import event


        @event.listens_for(SomeSessionClassOrObject, 'pending_to_transient')
        def receive_pending_to_transient(session, instance):
            "listen for the 'pending_to_transient' event"

            # ... (event handling logic) ...


This less common transition occurs when an pending object that has
not been flushed is evicted from the session; this can occur
when the :meth:`.Session.rollback` method rolls back the transaction,
or when the :meth:`.Session.expunge` method is used.

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

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

.. seealso::

    :ref:`session_lifecycle_events`

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