public ActionResult <IEnumerable <CourseAuthorDto> > Get(string courseName = "", string authorName = "")
{
/*
* Author a = _repository.GetAuthors().First();
* a.FirstName = a.FirstName + " - 1";
* _repository.UpdateAuthor(a);
* _repository.Save();
*/
return(new ActionResult <IEnumerable <CourseAuthorDto> >(_repository.GetCourseAuthors(courseName, authorName)));
}