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[Brian Haley <1777908@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1777908

Title:
   Ensure _get_changed_synthetic_fields() return updatable fields -
  breaks consumers

Status in neutron:
  Fix Released

Bug description:
  It appears the landing of [1] into stable/queens has broken some
  consumers, at least vmware-nsx.

  When running with [1] in neutron/queens, we now get:
  ----
  security_group_rule is already registered
  Loaded quota_driver: <neutron.db.quota.driver.DbQuotaDriver object at 0x7fd805e1e750>.
  Loaded quota_driver: <neutron.db.quota.driver.DbQuotaDriver object at 0x7ff8b1e0c790>.
  create failed: No details.: DetachedInstanceError: Parent instance <SecurityGroup at 0x7fd804039f10> is not bound to a Session; lazy load operation of attribute 'ext_properties' cannot proceed (Background on this error at: http://sqlalche.me/e/bhk3)
  Traceback (most recent call last):
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/api/v2/resource.py", line 98, in resource
      result = method(request=request, **args)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/api/v2/base.py", line 425, in create
      return self._create(request, body, **kwargs)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/db/api.py", line 91, in wrapped
      setattr(e, '_RETRY_EXCEEDED', True)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/db/api.py", line 87, in wrapped
      return f(*args, **kwargs)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_db/api.py", line 154, in wrapper
      ectxt.value = e.inner_exc
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_db/api.py", line 142, in wrapper
      return f(*args, **kwargs)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/db/api.py", line 126, in wrapped
      LOG.debug("Retry wrapper got retriable exception: %s", e)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/db/api.py", line 122, in wrapped
      return f(*dup_args, **dup_kwargs)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/api/v2/base.py", line 539, in _create
      obj = do_create(body)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/api/v2/base.py", line 521, in do_create
      request.context, reservation.reservation_id)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/api/v2/base.py", line 514, in do_create
      return obj_creator(request.context, **kwargs)
    File "vmware_nsx/tests/unit/extensions/test_provider_security_groups.py", line 53, in create_security_group
      context, security_group)
    File "vmware_nsx/db/extended_security_group.py", line 77, in create_provider_security_group
      context, security_group, False, True)
    File "vmware_nsx/db/extended_security_group.py", line 107, in create_security_group_without_rules
      secgroup_dict = self._make_security_group_dict(sg)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/db/securitygroups_db.py", line 280, in _make_security_group_dict
      security_group.db_obj)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/src/neutron/neutron/db/_resource_extend.py", line 75, in apply_funcs
      resolved_func(response, db_object)
    File "vmware_nsx/db/extended_security_group.py", line 348, in _extend_security_group_with_properties
      if sg_db.ext_properties:
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 242, in __get__
      return self.impl.get(instance_state(instance), dict_)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 599, in get
      value = self.callable_(state, passive)
    File "/home/boden/src/vmware-nsx/.tox/py27-dev/local/lib/python2.7/site-packages/sqlalchemy/orm/strategies.py", line 596, in _load_for_state
      (orm_util.state_str(state), self.key)
  DetachedInstanceError: Parent instance <SecurityGroup at 0x7fd804039f10> is not bound to a Session; lazy load operation of attribute 'ext_properties' cannot proceed (Background on this error at: http://sqlalche.me/e/bhk3)

  {0} vmware_nsx.tests.unit.extensions.test_provider_security_groups.ProviderSecurityGroupExtTestCase.test_create_provider_security_groups_same_tenant [0.806920s] ... FAILED
  ----

  If I manually revert [1] in neutron/queens of my workspace, the test passes.
  ATM I'm only testing locally; working on a sample patch for the gate to reference here.

  Is there a way we can do [1] without breaking consumers?

  
  [1] https://review.openstack.org/#/c/573617/

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