/**
  * @param array $obj_ids
  * @param array $ref_ids
  */
 public function _preloadData($obj_ids, $ref_ids)
 {
     /*
     We are only able to preload the top_pk values for the forum ref_ids.
     Other data like statistics and last posts require permission checks per reference, so there is no added value for using an SQL IN() function in the queries
     */
     ilObjForum::preloadForumIdsByRefIds((array) $ref_ids);
 }