Function object_session

lib/sqlalchemy/orm/session.py:5450–5463

Return the :class:`.Session` to which the given instance belongs. This is essentially the same as the :attr:`.InstanceState.session` accessor. See that attribute for details.

(instance: object)

def object_session(instance: object) -> Optional[Session]:
    """Return the :class:`.Session` to which the given instance belongs.

    This is essentially the same as the :attr:`.InstanceState.session`
    accessor.  See that attribute for details.

    """

    try:
        state = attributes.instance_state(instance)
    except exc.NO_STATE as err:
        raise exc.UnmappedInstanceError(instance) from err
    else:
        return _state_session(state)


_new_sessionid = util.counter()