public ActionResult <IEnumerable <CourseDto> > GetCourses(int authorId) { var author = _courseLibraryRepository.GetAuthor(authorId); if (author == null) { return(NotFound()); } var coursesFromRepo = _courseLibraryRepository.GetAllCourse(authorId); return(Ok(_mapper.Map <IEnumerable <CourseDto> >(coursesFromRepo))); }