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);
}