old_contents: # coding=utf-8
  #
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  from oslo_versionedobjects import fields
  
  from magnum.objects import base
  
  
  @base.MagnumObjectRegistry.register
  class Certificate(base.MagnumPersistentObject, base.MagnumObject,
                    base.MagnumObjectDictCompat):
      # Version 1.0: Initial version
      # Version 1.1: Rename bay_uuid to cluster_uuid
      VERSION = '1.1'
  
      fields = {
          'project_id': fields.StringField(nullable=True),
          'user_id': fields.StringField(nullable=True),
          'cluster_uuid': fields.StringField(nullable=True),
          'csr': fields.StringField(nullable=True),
          'pem': fields.StringField(nullable=True),
      }
  
      @classmethod
      def from_object_cluster(cls, cluster):
          return cls(project_id=cluster.project_id,
                     user_id=cluster.user_id,
                     cluster_uuid=cluster.uuid)
  
      @classmethod
      def from_db_cluster(cls, cluster):
          return cls(project_id=cluster['project_id'],
                     user_id=cluster['user_id'],
                     cluster_uuid=cluster['uuid'])
  
new_contents: # coding=utf-8
  #
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  from oslo_versionedobjects import fields
  
  from magnum.objects import base
  
  
  @base.MagnumObjectRegistry.register
  class Certificate(base.MagnumPersistentObject, base.MagnumObject):
      # Version 1.0: Initial version
      # Version 1.1: Rename bay_uuid to cluster_uuid
      VERSION = '1.1'
  
      fields = {
          'project_id': fields.StringField(nullable=True),
          'user_id': fields.StringField(nullable=True),
          'cluster_uuid': fields.StringField(nullable=True),
          'csr': fields.StringField(nullable=True),
          'pem': fields.StringField(nullable=True),
      }
  
      @classmethod
      def from_object_cluster(cls, cluster):
          return cls(project_id=cluster.project_id,
                     user_id=cluster.user_id,
                     cluster_uuid=cluster.uuid)
  
      @classmethod
      def from_db_cluster(cls, cluster):
          return cls(project_id=cluster['project_id'],
                     user_id=cluster['user_id'],
                     cluster_uuid=cluster['uuid'])
  
subject: Remove the usage of MagnumObjectDictCompat from certificate