1 files changed, 40 insertions, 0 deletions
diff --git a/app/graphql/mutations/merge_requests/request_attention.rb b/app/graphql/mutations/merge_requests/request_attention.rb
new file mode 100644
index 00000000000..5f5565285f6
--- /dev/null
+++ b/app/graphql/mutations/merge_requests/request_attention.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+module Mutations
+  module MergeRequests
+    class RequestAttention < Base
+      graphql_name 'MergeRequestRequestAttention'
+
+      argument :user_id, ::Types::GlobalIDType[::User],
+               loads: Types::UserType,
+               required: true,
+               description: <<~DESC
+                            User ID of the user to request attention.
+               DESC
+
+      def resolve(project_path:, iid:, user:)
+        raise Gitlab::Graphql::Errors::ResourceNotAvailable, 'Feature disabled' unless feature_enabled?
+
+        merge_request = authorized_find!(project_path: project_path, iid: iid)
+
+        result = ::MergeRequests::RequestAttentionService.new(
+          project: merge_request.project,
+          current_user: current_user,
+          merge_request: merge_request,
+          user: user
+        ).execute
+
+        {
+          merge_request: merge_request,
+          errors: Array(result[:message])
+        }
+      end
+
+      private
+
+      def feature_enabled?
+        current_user&.mr_attention_requests_enabled?
+      end
+    end
+  end
+end