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[jichenjc <jichenjc@xxxxxxxxxx>]

Public bug reported:

Add a new plugin lead to following error, the root cause is servers was loaded after volumes
so the inherits.controller is None

if resource.inherits:
                inherits = self.resources.get(resource.inherits)
                if not resource.controller:
                    resource.controller = inherits.controller


ERROR [stevedore.extension] error calling 'volumes': 'NoneType' object has no attribute 'controller'
ERROR [stevedore.extension] 'NoneType' object has no attribute 'controller'
Traceback (most recent call last):
  File "/home/jichen/git/nova/.venv/local/lib/python2.7/site-packages/stevedore/extension.py", line 248, in _invoke_one_plugin
    response_callback(func(e, *args, **kwds))
  File "/home/jichen/git/nova/nova/api/openstack/__init__.py", line 376, in _register_resources
    resource.controller = inherits.controller
AttributeError: 'NoneType' object has no attribute 'controller'
DEBUG [nova.api.openstack] Running _register_resources on <nova.api.openstack.compute.plugins.v3.servers.Servers object at 0xb484d6c>

** Affects: nova
     Importance: Undecided
     Assignee: jichenjc (jichenjc)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => jichenjc (jichenjc)

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https://bugs.launchpad.net/bugs/1373238

Title:
  load extension lead to error calling 'volumes': 'NoneType' object has
  no attribute 'controller' for v3 api

Status in OpenStack Compute (Nova):
  New

Bug description:
  Add a new plugin lead to following error, the root cause is servers was loaded after volumes
  so the inherits.controller is None

  if resource.inherits:
                  inherits = self.resources.get(resource.inherits)
                  if not resource.controller:
                      resource.controller = inherits.controller

  
  ERROR [stevedore.extension] error calling 'volumes': 'NoneType' object has no attribute 'controller'
  ERROR [stevedore.extension] 'NoneType' object has no attribute 'controller'
  Traceback (most recent call last):
    File "/home/jichen/git/nova/.venv/local/lib/python2.7/site-packages/stevedore/extension.py", line 248, in _invoke_one_plugin
      response_callback(func(e, *args, **kwds))
    File "/home/jichen/git/nova/nova/api/openstack/__init__.py", line 376, in _register_resources
      resource.controller = inherits.controller
  AttributeError: 'NoneType' object has no attribute 'controller'
  DEBUG [nova.api.openstack] Running _register_resources on <nova.api.openstack.compute.plugins.v3.servers.Servers object at 0xb484d6c>

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