Module « sqlalchemy.orm »

Fonction subqueryload - module sqlalchemy.orm

Signature de la fonction subqueryload

def subqueryload(*keys) 

Description

subqueryload.__doc__

Indicate that the given attribute should be loaded using
    subquery eager loading.

    This function is part of the :class:`_orm.Load` interface and supports
    both method-chained and standalone operation.

    examples::

        # subquery-load the "orders" collection on "User"
        query(User).options(subqueryload(User.orders))

        # subquery-load Order.items and then Item.keywords
        query(Order).options(
            subqueryload(Order.items).subqueryload(Item.keywords))

        # lazily load Order.items, but when Items are loaded,
        # subquery-load the keywords collection
        query(Order).options(
            lazyload(Order.items).subqueryload(Item.keywords))


    .. seealso::

        :ref:`loading_toplevel`

        :ref:`subquery_eager_loading`