public function save()
 {
     $con = Propel::getConnection();
     try {
         $con->beginTransaction();
         foreach ($this->students as $student) {
             $student_attendance = StudentAttendancePeer::retrieveOrCreate($student, $this->course_subject_id, $this->day, $this->career_school_year_id);
             $name = 'student_attendance_' . $student->getId() . '_' . $this->day;
             $this->setStudentAttendanceValue($name, $student_attendance);
             $student_attendance->save($con);
         }
         $con->commit();
     } catch (PropelExeption $e) {
         $con->rollBack();
         throw $e;
     }
 }
 public function save()
 {
     $con = Propel::getConnection();
     try {
         $con->beginTransaction();
         foreach ($this->students as $student) {
             foreach ($this->days as $day => $day_i) {
                 $student_attendance = StudentAttendancePeer::retrieveOrCreate($student, $this->course_subject_id, $day_i, $this->career_school_year_id);
                 if (!$this->getValue('day_disabled_' . $day)) {
                     $name = 'student_attendance_' . $student->getId() . '_' . $day;
                     $this->setStudentAttendanceValue($name, $student_attendance);
                     $student_attendance->save($con);
                 } elseif (!$student_attendance->isNew()) {
                     $student_attendance->delete($con);
                 }
             }
         }
         $con->commit();
     } catch (PropelExeption $e) {
         $con->rollBack();
         throw $e;
     }
 }