Comment 21 for bug 1541928

Reviewed: https://review.openstack.org/301837
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=34a328fe12950c339b8259451262470c627f2f00
Submitter: Jenkins
Branch: master

commit 34a328fe12950c339b8259451262470c627f2f00
Author: Ihar Hrachyshka <email address hidden>
Date: Tue Apr 5 19:00:21 2016 +0200

    standard attributes: expose created_at/updated_at on models

    Instead of enforcing all model users to know that those fields belong to
    a separate model, consistently use association_proxy for all standard
    attributes similar to what we already do with description.

    This change should reduce some complexity in db handling code, for
    example for versioned objects.

    Change-Id: I2df5c3514e1f868baa835adff2d95c1156ec7384
    Related-Bug: #1541928