$db->beginTransaction();
            $obj = new Lectures(array('lec_date' => $lec_date, 'attd_mst_id' => $queries['mst']));
            $db->insert($obj);
            $db->prepare();
            $db->execute();
            $lec_id = $db->getLastGeneratedValue();
            $db->setInsert(new Attendance());
            $abs_objs = array();
            foreach ($students['data'] as $stud) {
                //$ids[]=$stud['stud_id'];
                $presence = 1;
                if (in_array($stud['stud_id'], $abs_ids)) {
                    $presence = 0;
                }
                $abs_objs[] = new Attendance(array('lec_id' => $lec_id, 'stud_id' => $stud['stud_id'], 'presence' => $presence));
            }
            $db->multiInsert($abs_objs);
            $db->execute();
            $db->commit();
            echo json_encode(array('done' => true, 'final' => 'Attendance Added Successfully!'));
        } catch (\Exception $e) {
            $db->rollback();
            $message = $e->getPrevious() ? $e->getPrevious()->getMessage() : $e->getMessage();
            $code = $e->getPrevious() ? $e->getPrevious()->getCode() : $e->getCode();
            $err = "Error Code: " . $code . " <br/>Detailed Info: " . $message;
            attd_error(HTTP_Status::INTERNAL_SERVER_ERROR, $err);
        }
    } else {
        attd_error($students['code'], isset($students['message']) ? $students['message'] : "");
    }
}