public async Task <IActionResult> Detail(int id)
        {
            Genre genre = await _genres.GetById(id);

            if (genre != null)
            {
                ICollection <Movie> movies = await _genres.GetMovies(id);

                var detailModel = new GenreDetailModel
                {
                    Id     = genre.Id,
                    Name   = genre.Name,
                    Movies = movies
                             .Select(movie => new KeyValuePair <int, string>(movie.Id, movie.Title))
                             .ToDictionary(kvp => kvp.Key, kvp => kvp.Value)
                };

                return(View(detailModel));
            }

            return(NotFound());
        }