1 files changed, 21 insertions, 0 deletions
diff --git a/lib/gitlab/graphql/copy_field_description.rb b/lib/gitlab/graphql/copy_field_description.rb
new file mode 100644
index 00000000000..edd73083ff2
--- /dev/null
+++ b/lib/gitlab/graphql/copy_field_description.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module CopyFieldDescription
+      extend ActiveSupport::Concern
+
+      class_methods do
+        # Returns the `description` for property of field `field_name` on type.
+        # This can be used to ensure, for example, that mutation argument descriptions
+        # are always identical to the corresponding query field descriptions.
+        #
+        # E.g.:
+        #   argument :name, GraphQL::STRING_TYPE, description: copy_field_description(Types::UserType, :name)
+        def copy_field_description(type, field_name)
+          type.fields[field_name.to_s.camelize(:lower)].description
+        end
+      end
+    end
+  end
+end