+ el1['changeset'] = self.changeset_id.to_s
+
+ if changeset_cache.key?(self.changeset_id)
+ # use the cache if available
+ else
+ changeset_cache[self.changeset_id] = self.changeset.user_id
+ end
+
+ user_id = changeset_cache[self.changeset_id]
+
+ if user_display_name_cache.key?(user_id)
+ # use the cache if available
+ elsif self.changeset.user.data_public?
+ user_display_name_cache[user_id] = self.changeset.user.display_name
+ else
+ user_display_name_cache[user_id] = nil
+ end