public ActionResult <List <UserInterfaceObjects.SoundFile> > GetSoundFiles( [FromRoute] Guid playListId) { var userId = User.GetUserId(); var soundFiles = _playListService .GetSoundFiles(userId, playListId) .ToUserInterfaceObjects(); _libraryService.ProcessIsFavoriteFlag(User.GetUserId(), soundFiles); return(Ok(soundFiles)); }