public function get_links() { if (is_null($this->links)) { $this->links = LinkRepository::instance()->find_by_category($this); } return $this->links; }
public function find_link_by_url($url) { $c_id = $this->c_id; $session_id = $this->session_id; $repo = LinkRepository::instance(); $link = $repo->find_one_by_course_and_url($c_id, $session_id, $url); return $link; }