public static AlbumsModel GetAlbumsModel(int? genreId)
 {
     var albumRepository = new AlbumRepository();
     var model = new AlbumsModel();
     model.Albums =
         albumRepository.GetAlbums(genreId)
             .Select(
                 album =>
                   AlbumToAlbumModel(album))
             .ToList();
     if (genreId.HasValue)
     {
         var genreRepository = new GenreRepository();
         model.Genre = genreRepository.GetGenre((int)genreId);
     }
     return model;
 }