1 files changed, 39 insertions, 0 deletions
diff --git a/app/graphql/mutations/merge_requests/update.rb b/app/graphql/mutations/merge_requests/update.rb
new file mode 100644
index 00000000000..b583fdfca9b
--- /dev/null
+++ b/app/graphql/mutations/merge_requests/update.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module Mutations
+  module MergeRequests
+    class Update < Base
+      graphql_name 'MergeRequestUpdate'
+
+      description 'Update attributes of a merge request'
+
+      argument :title, GraphQL::STRING_TYPE,
+               required: false,
+               description: copy_field_description(Types::MergeRequestType, :title)
+
+      argument :target_branch, GraphQL::STRING_TYPE,
+               required: false,
+               description: copy_field_description(Types::MergeRequestType, :target_branch)
+
+      argument :description, GraphQL::STRING_TYPE,
+               required: false,
+               description: copy_field_description(Types::MergeRequestType, :description)
+
+      def resolve(args)
+        merge_request = authorized_find!(args.slice(:project_path, :iid))
+        attributes = args.slice(:title, :description, :target_branch).compact
+
+        ::MergeRequests::UpdateService
+          .new(merge_request.project, current_user, attributes)
+          .execute(merge_request)
+
+        errors = errors_on_object(merge_request)
+
+        {
+          merge_request: merge_request.reset,
+          errors: errors
+        }
+      end
+    end
+  end
+end