Module « sqlalchemy.orm »

Fonction defaultload - module sqlalchemy.orm

Signature de la fonction defaultload

def defaultload(*keys) 

Description

defaultload.__doc__

Indicate an attribute should load using its default loader style.

    This method is used to link to other loader options further into
    a chain of attributes without altering the loader style of the links
    along the chain.  For example, to set joined eager loading for an
    element of an element::

        session.query(MyClass).options(
            defaultload(MyClass.someattribute).
            joinedload(MyOtherClass.someotherattribute)
        )

    :func:`.defaultload` is also useful for setting column-level options
    on a related class, namely that of :func:`.defer` and :func:`.undefer`::

        session.query(MyClass).options(
            defaultload(MyClass.someattribute).
            defer("some_column").
            undefer("some_other_column")
        )

    .. seealso::

        :meth:`_orm.Load.options` - allows for complex hierarchical
        loader option structures with less verbosity than with individual
        :func:`.defaultload` directives.

        :ref:`relationship_loader_options`

        :ref:`deferred_loading_w_multiple`