public function getNgTestSubject($con = null) { include_once 'lib/model/om/BaseNgTestSubjectPeer.php'; if ($this->aNgTestSubject === null && $this->ng_test_subject_id !== null) { $this->aNgTestSubject = NgTestSubjectPeer::retrieveByPK($this->ng_test_subject_id, $con); } return $this->aNgTestSubject; }