# File lib/fog/compute/requests/aws/modify_snapshot_attribute.rb, line 19
        def modify_snapshot_attribute(snapshot_id, attribute, operation_type, options = {})
          params = {}
          params.merge!(Fog::AWS.indexed_param('UserId', options['UserId']))
          params.merge!(Fog::AWS.indexed_param('UserGroup', options['UserGroup']))
          request({
            'Action'        => 'ModifySnapshotAttribute',
            'Attribute'     => attribute,
            'SnapshotId'    => snapshot_id,
            'OperationType' => operation_type,
            :idempotent     => true,
            :parser         => Fog::Parsers::Compute::AWS::Basic.new
          }.merge!(params))
        end