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[Dolph Mathews <1211445@xxxxxxxxxxxxxxxxxx>]

Not able to reproduce.

** Changed in: keystone
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1211445

Title:
  deleting an unassigned role causes 500

Status in OpenStack Identity (Keystone):
  Invalid

Bug description:
  I would assume that this is directly related to bug 1210590, but I'm
  filing separately just in case.

  request:

  DELETE
  http://localhost:35357/v3/roles/9cf9fc40486947539a10400e638b9e65

  response:

  {
    "error": {
      "message": "An unexpected error prevented the server from fulfilling your request. 'unicode' object has no attribute 'items'", 
      "code": 500, 
      "title": "Internal Server Error"
    }
  }

  backtrace:

  ERROR [keystone.common.wsgi] 'unicode' object has no attribute 'items'
  Traceback (most recent call last):
    File "/Users/dolph/Projects/keystone/keystone/common/wsgi.py", line 240, in __call__
      result = method(context, **params)
    File "/Users/dolph/Projects/keystone/keystone/common/controller.py", line 106, in wrapper
      return f(self, context, *args, **kwargs)
    File "/Users/dolph/Projects/keystone/keystone/identity/controllers.py", line 749, in delete_role
      return self.identity_api.delete_role(role_id)
    File "/Users/dolph/Projects/keystone/keystone/identity/core.py", line 141, in delete_role
      return self.assignment_api.delete_role(role_id)
    File "/Users/dolph/Projects/keystone/keystone/common/manager.py", line 44, in _wrapper
      return f(*args, **kw)
    File "/Users/dolph/Projects/keystone/keystone/assignment/backends/sql.py", line 600, in delete_role
      project_id=metadata_ref.project_id)
    File "/Users/dolph/Projects/keystone/keystone/assignment/backends/sql.py", line 211, in delete_grant
      role_id, inherited_to_projects, metadata_ref.get('roles', []))
    File "/Users/dolph/Projects/keystone/keystone/assignment/core.py", line 244, in _remove_role_from_role_dicts
      role_set = set([frozenset(r.items()) for r in dict_list])
  AttributeError: 'unicode' object has no attribute 'items'

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