public async Task <Unit> Handle(AddTracksToPlaylistCommand request, CancellationToken cancellationToken)
{
if (request is null)
{
throw new ArgumentNullException(nameof(request));
}
Playlist playlistDomain = await _catalogRepository.GetPlaylist(request.PlaylistId, cancellationToken);
if (playlistDomain == null)
{
throw new EntityNotFoundException($"A playlist having id '{request.PlaylistId}' could not be found");
}
await _catalogRepository.AddTracksToPlaylist(playlistDomain, request.TrackIds, cancellationToken);
return(Unit.Value);
}
