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Classe « MapperEvents »

Méthode sqlalchemy.orm.MapperEvents.after_mapper_constructed

Signature de la méthode after_mapper_constructed

def after_mapper_constructed(self, mapper: 'Mapper[_O]', class_: 'Type[_O]') -> 'None' 

Description

help(MapperEvents.after_mapper_constructed)

Receive a class and mapper when the :class:`_orm.Mapper` has been
fully constructed.

.. container:: event_signatures

     Example argument forms::

        from sqlalchemy import event


        @event.listens_for(SomeClass, 'after_mapper_constructed')
        def receive_after_mapper_constructed(mapper, class_):
            "listen for the 'after_mapper_constructed' event"

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


This event is called after the initial constructor for
:class:`_orm.Mapper` completes.  This occurs after the
:meth:`_orm.MapperEvents.instrument_class` event and after the
:class:`_orm.Mapper` has done an initial pass of its arguments
to generate its collection of :class:`_orm.MapperProperty` objects,
which are accessible via the :meth:`_orm.Mapper.get_property`
method and the :attr:`_orm.Mapper.iterate_properties` attribute.

This event differs from the
:meth:`_orm.MapperEvents.before_mapper_configured` event in that it
is invoked within the constructor for :class:`_orm.Mapper`, rather
than within the :meth:`_orm.registry.configure` process.   Currently,
this event is the only one which is appropriate for handlers that
wish to create additional mapped classes in response to the
construction of this :class:`_orm.Mapper`, which will be part of the
same configure step when :meth:`_orm.registry.configure` next runs.

.. versionadded:: 2.0.2

.. seealso::

    :ref:`examples_versioning` - an example which illustrates the use
    of the :meth:`_orm.MapperEvents.before_mapper_configured`
    event to create new mappers to record change-audit histories on
    objects.

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