1 files changed, 46 insertions, 0 deletions
diff --git a/app/graphql/mutations/design_management/move.rb b/app/graphql/mutations/design_management/move.rb
new file mode 100644
index 00000000000..0b654447844
--- /dev/null
+++ b/app/graphql/mutations/design_management/move.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module Mutations
+  module DesignManagement
+    class Move < ::Mutations::BaseMutation
+      graphql_name "DesignManagementMove"
+
+      DesignID = ::Types::GlobalIDType[::DesignManagement::Design]
+
+      argument :id, DesignID, required: true, as: :current_design,
+               description: "ID of the design to move"
+
+      argument :previous, DesignID, required: false, as: :previous_design,
+               description: "ID of the immediately preceding design"
+
+      argument :next, DesignID, required: false, as: :next_design,
+               description: "ID of the immediately following design"
+
+      field :design_collection, Types::DesignManagement::DesignCollectionType,
+            null: true,
+            description: "The current state of the collection"
+
+      def ready(*)
+        raise ::Gitlab::Graphql::Errors::ResourceNotAvailable unless ::Feature.enabled?(:reorder_designs, default_enabled: true)
+      end
+
+      def resolve(**args)
+        service = ::DesignManagement::MoveDesignsService.new(current_user, parameters(args))
+
+        { design_collection: service.collection, errors: service.execute.errors }
+      end
+
+      private
+
+      def parameters(**args)
+        args.transform_values { |id| GitlabSchema.find_by_gid(id) }.transform_values(&:sync).tap do |hash|
+          hash.each { |k, design| not_found(args[k]) unless current_user.can?(:read_design, design) }
+        end
+      end
+
+      def not_found(gid)
+        raise Gitlab::Graphql::Errors::ResourceNotAvailable, "Resource not available: #{gid}"
+      end
+    end
+  end
+end