# File lib/fog/compute/openstack/requests/set_metadata.rb, line 16
        def set_metadata(collection_name, parent_id, metadata = {})
          if collection_name == "images"
            unless list_images_detail.body['images'].find { |image| image['id'] == parent_id }
              raise Fog::Compute::OpenStack::NotFound
            end
          end

          if collection_name == "servers"
            unless list_servers_detail.body['servers'].find { |server| server['id'] == parent_id }
              raise Fog::Compute::OpenStack::NotFound
            end
          end

          response = Excon::Response.new
          response.body = {"metadata" => metadata}
          response.status = 200
          response
        end