Classe « registry »

Méthode sqlalchemy.orm.registry.configure

Signature de la méthode configure

def configure(self, cascade=False) 

Description

configure.__doc__

Configure all as-yet unconfigured mappers in this
        :class:`_orm.registry`.

        The configure step is used to reconcile and initialize the
        :func:`_orm.relationship` linkages between mapped classes, as well as
        to invoke configuration events such as the
        :meth:`_orm.MapperEvents.before_configured` and
        :meth:`_orm.MapperEvents.after_configured`, which may be used by ORM
        extensions or user-defined extension hooks.

        If one or more mappers in this registry contain
        :func:`_orm.relationship` constructs that refer to mapped classes in
        other registries, this registry is said to be *dependent* on those
        registries. In order to configure those dependent registries
        automatically, the :paramref:`_orm.registry.configure.cascade` flag
        should be set to ``True``. Otherwise, if they are not configured, an
        exception will be raised.  The rationale behind this behavior is to
        allow an application to programmatically invoke configuration of
        registries while controlling whether or not the process implicitly
        reaches other registries.

        As an alternative to invoking :meth:`_orm.registry.configure`, the ORM
        function :func:`_orm.configure_mappers` function may be used to ensure
        configuration is complete for all :class:`_orm.registry` objects in
        memory. This is generally simpler to use and also predates the usage of
        :class:`_orm.registry` objects overall. However, this function will
        impact all mappings throughout the running Python process and may be
        more memory/time consuming for an application that has many registries
        in use for different purposes that may not be needed immediately.

        .. seealso::

            :func:`_orm.configure_mappers`


        .. versionadded:: 1.4.0b2