public async Task <ActionResult <IEnumerable <SubjectDto> > > GetTimetableAsync(Guid studentId) { if (!_repository.StudentExists(studentId)) { return(NotFound()); } // get lessons // order lessons var student = await _repository.GetStudentAsync(studentId); if (student == null) { return(NotFound()); } var lessons = await _repository.GetLessonsForStudent(studentId); return(Ok(lessons)); }