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[NITIN GUPTA <nitin291989@xxxxxxxxx>]

Hi Lance,

Patch has been merged into master branch.
Could Please check and confirm.
Also, please suggest further processing on this, if needed.

Thanks.

** Changed in: keystone
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1614154

Title:
  Hints with values of None seem to be broken

Status in OpenStack Identity (keystone):
  Fix Released

Bug description:
  The Hints object allows developers to construct filters to query the
  backend for specific entries. For example, I can ask the backend to
  give me a list of entities that match a specific criteria:

  hints = driver_hints.Hints()
  hints.add_filter('key_hash', primary_key_hash)
  credentials = self.credential_api.list_credentials(hints)

  The above example should give me all credentials that have a key_hash
  column matching the value of primary_key_hash. If I try to apply this
  same pattern using None as the value to match, I get an error:

  http://cdn.pasteraw.com/qv8yl0azk4iu7hwjhkz2ty5c8ti6mb1

  It seems that Hints doesn't allow you to filter a backend by "return
  to me all things that have this attribute set to NULL", even though we
  expect this to work in our code [0].

  [0]
  https://github.com/openstack/keystone/blob/0b4f6ebdcc866388e1c6788f45f270414b45aeef/keystone/assignment/controllers.py#L437

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