# File lib/fog/baremetal/openstack/models/chassis.rb, line 23
        def update(patch = nil)
          requires :uuid, :description
          if patch
            merge_attributes(service.patch_chassis(uuid, patch).body)
          else
            # TODO: implement update_node method using PUT method and self.attributes
            # once it is supported by Ironic
            raise ArgumentError,
                  'You need to provide patch attribute. Ironic does not support update by hash yet, only by jsonpatch.'
          end
          self
        end