Classe « AttributeState »

Méthode sqlalchemy.orm.AttributeState.load_history

Signature de la méthode load_history

def load_history(self) 

Description

load_history.__doc__

Return the current **pre-flush** change history for
        this attribute, via the :class:`.History` interface.

        This method **will** emit loader callables if the value of the
        attribute is unloaded.

        .. note::

            The attribute history system tracks changes on a **per flush
            basis**. Each time the :class:`.Session` is flushed, the history
            of each attribute is reset to empty.   The :class:`.Session` by
            default autoflushes each time a :class:`_query.Query` is invoked.
            For
            options on how to control this, see :ref:`session_flushing`.

        .. seealso::

            :attr:`.AttributeState.history`

            :func:`.attributes.get_history` - underlying function

        .. versionadded:: 0.9.0