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Module « sqlalchemy.orm »

Fonction reconstructor - module sqlalchemy.orm

Signature de la fonction reconstructor

def reconstructor(fn) 

Description

help(sqlalchemy.orm.reconstructor)

Decorate a method as the 'reconstructor' hook.

Designates a single method as the "reconstructor", an ``__init__``-like
method that will be called by the ORM after the instance has been
loaded from the database or otherwise reconstituted.

.. tip::

    The :func:`_orm.reconstructor` decorator makes use of the
    :meth:`_orm.InstanceEvents.load` event hook, which can be
    used directly.

The reconstructor will be invoked with no arguments.  Scalar
(non-collection) database-mapped attributes of the instance will
be available for use within the function.  Eagerly-loaded
collections are generally not yet available and will usually only
contain the first element.  ORM state changes made to objects at
this stage will not be recorded for the next flush() operation, so
the activity within a reconstructor should be conservative.

.. seealso::

    :meth:`.InstanceEvents.load`

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