1 files changed, 34 insertions, 0 deletions
diff --git a/app/graphql/mutations/notes/base.rb b/app/graphql/mutations/notes/base.rb
new file mode 100644
index 00000000000..a7198f5fba6
--- /dev/null
+++ b/app/graphql/mutations/notes/base.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module Mutations
+  module Notes
+    class Base < BaseMutation
+      include Gitlab::Graphql::Authorize::AuthorizeResource
+
+      field :note,
+            Types::Notes::NoteType,
+            null: true,
+            description: 'The note after mutation'
+
+      private
+
+      def find_object(id:)
+        GitlabSchema.object_from_id(id)
+      end
+
+      def check_object_is_noteable!(object)
+        unless object.is_a?(Noteable)
+          raise Gitlab::Graphql::Errors::ResourceNotAvailable,
+                'Cannot add notes to this resource'
+        end
+      end
+
+      def check_object_is_note!(object)
+        unless object.is_a?(Note)
+          raise Gitlab::Graphql::Errors::ResourceNotAvailable,
+                'Resource is not a note'
+        end
+      end
+    end
+  end
+end