Hi, I sent a simple patch to check the possibility to add results to callbacks: https://review.openstack.org/#/c/201127/ This will allow us to decouple the callback logic from the ML2 plugin in the QoS scenario where we need to update the agents in case the profile_id on a port/network changes. It will also allow for a cleaner way to extend resource attributes as AFTER_READ callbacks can return a dict of fields to add to the original resource instead of mutating it directly. Please let me know what you think of this idea. Regards, Mike -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20150713/96b5d6a5/attachment.html>