public ActionResult <CoursesDto> CreateCourse(Guid authorId, CourseForCreationDto course)
{
if (!_courseLibraryRepository.AuthorExist(authorId))
{
return(NotFound());
}
var courseEntities = _mapper.Map <Entities.Course>(course);
_courseLibraryRepository.AddCourses(authorId, courseEntities);
_courseLibraryRepository.Save();
var courseToReturn = _mapper.Map <CoursesDto>(courseEntities);
return(CreatedAtRoute("GetCourseForAuthor", new { authorId, courseId = courseToReturn.Id }, courseToReturn));
}