public async Task <Unit> Handle(AddSongsToPlaylistCommand command, CancellationToken cancellationToken)
{
var playlist = await _dbContext.Playlists.FindAsync(command.PlaylistId);
if (playlist == null)
{
throw new NotFoundException("Playlist", command.PlaylistId);
}
CheckThatAlbumsExist(command);
CheckThatSongsExist(command);
var tracks = _dbContext.Tracks.Include(t => t.Album)
.Where(t => command.TrackIds.Contains(t.Id) || command.AlbumIds.Contains(t.Album.Id));
await tracks.ForEachAsync(t =>
_dbContext.PlaylistTracks.Add(new PlaylistTrack {
Track = t, Playlist = playlist
}),
cancellationToken);
playlist.TotalTracks = playlist.PlaylistTracks.Count;
await _dbContext.SaveChangesAsync(cancellationToken);
return(Unit.Value);
}
public async Task <Unit> Handle(CreatePlaylistCommand request, CancellationToken cancellationToken)
{
var user = await _context.Users.FindAsync(request.UserId);
if (user == null)
{
throw new NotFoundException(nameof(User), request.UserId);
}
var playlist = new Playlist
{
Name = request.Name,
User = user,
TotalTracks = 0
};
await _context.Playlists.AddAsync(playlist, cancellationToken);
await _context.SaveChangesAsync(cancellationToken);
return(Unit.Value);
}