Module « sqlalchemy.orm »

Fonction selectinload - module sqlalchemy.orm

Signature de la fonction selectinload

def selectinload(*keys) 

Description

selectinload.__doc__

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

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

    examples::

        # selectin-load the "orders" collection on "User"
        query(User).options(selectinload(User.orders))

        # selectin-load Order.items and then Item.keywords
        query(Order).options(
            selectinload(Order.items).selectinload(Item.keywords))

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

    .. versionadded:: 1.2

    .. seealso::

        :ref:`loading_toplevel`

        :ref:`selectin_eager_loading`