public function saveCourseSchedules(Request $request, $id)
 {
     $schedule = $request->all();
     $courseSchedule = new CourseSchedule();
     $courseSchedule['course_id'] = $id;
     $courseSchedule['status'] = 'approved';
     $courseSchedule->fill($schedule);
     $courseSchedule->save();
     return $courseSchedule->id;
 }