public static function retrieveOrCreateByDayAndBlockAndCourseSubjectId($day, $block, $course_subject_id)
{
$course_subject_day = self::retrieveByDayAndBlockAndCourseSubjectId($day, $block, $course_subject_id);
if (is_null($course_subject_day)) {
$course_subject_day = new CourseSubjectDay();
$course_subject_day->setDay($day);
$course_subject_day->setBlock($block);
$course_subject_day->setCourseSubjectId($course_subject_id);
}
return $course_subject_day;
}
