public void AddTrackToNewPlaylist(int trackId, string playlistName, int userId)
        {
            var user = _playlistRepository.GetById <User>(userId);

            var playlist = _playlistFactory.Produce(playlistName, user);

            playlist.UrlId = _playlistRepository.GenerateUrlId(playlist.Name, userId);

            _playlistRepository.Create(playlist);

            AddTrack(trackId, playlist.Id);
        }