protected function _get_pert($return_query = false)
 {
     $query = parent::_get_pert(true);
     if (get_class($this) == get_class()) {
         // Si cette classe est appelée directement, on cherche dans toutes les autorités donc on va chercher les concepts
         $searcher_authorities_concepts = new searcher_authorities_concepts($this->user_query);
         $concepts_pert_result = $searcher_authorities_concepts->get_pert_result(true);
         if ($concepts_pert_result) {
             $query = 'select ' . $this->object_key . ', sum(pert) as pert from ((' . $query . ') union all (' . $concepts_pert_result . ')) as search_query_concepts group by ' . $this->object_key;
         }
     }
     if ($return_query) {
         return $query;
     }
     $this->table_tempo = 'search_result' . md5(microtime(true));
     $rqt = 'create temporary table ' . $this->table_tempo . ' ' . $query;
     $res = pmb_mysql_query($rqt, $dbh);
     pmb_mysql_query('alter table ' . $table . ' add index i_id(' . $this->object_key . ')', $dbh);
 }