public function getThreads($items_per_page = 25, $page = 1) {
        $query = "SELECT topic_id FROM nuke_bbtopics WHERE forum_id = ? LIMIT ?, ?";
        
        foreach ($this->db->fetchAll($query, array($this->id, ($page - 1) * $items_per_page, $items_per_page)) as $row) {
            yield new Thread($row['topic_id']);