public async Task <IActionResult> Add(LessonDto lessonDto)
{
Subject subject = await _db.Subjects.FindAsync(lessonDto.SubjectId);
if (subject.TeacherId != _userService.UserId)
{
return(Forbid());
}
Lesson lesson = await _lessonService.AddAsync(lessonDto);
return(CreatedAtAction(nameof(GetById), new { id = lesson.Id }, _mapper.Map <LessonDto>(lesson)));
}
