public static Task TrackAsync(this IMediaTracker tracker, MediaTrack track)
{
if (track == null)
{
return(Task.CompletedTask);
}
return(tracker.TrackManyAsync(new[] { track }));
}
protected virtual async Task TrackSingleAsync(BaseEntity entity, int mediaFileId, string propertyName, MediaTrackOperation operation)
{
Guard.NotNull(entity, nameof(entity));
if (mediaFileId < 1 || entity.IsTransientRecord())
{
return;
}
var file = await _db.MediaFiles.FindByIdAsync(mediaFileId);
if (file != null)
{
var album = _folderService.FindAlbum(file)?.Value;
if (album == null)
{
throw new InvalidOperationException(T("Admin.Media.Exception.TrackUnassignedFile"));
}
else if (!album.CanDetectTracks)
{
// No support for tracking on album level, so get outta here.
return;
}
var track = new MediaTrack
{
EntityId = entity.Id,
EntityName = entity.GetEntityName(),
MediaFileId = mediaFileId,
Property = propertyName,
Album = album.Name
};
if (operation == MediaTrackOperation.Track)
{
file.Tracks.Add(track);
}
else
{
var dbTrack = file.Tracks.FirstOrDefault(x => x == track);
if (dbTrack != null)
{
file.Tracks.Remove(track);
_db.TryChangeState(dbTrack, EfState.Deleted);
}
}
if (file.Tracks.Count > 0)
{
// A file with tracks can NEVER be transient
file.IsTransient = false;
}
else if (_makeFilesTransientWhenOrphaned)
{
// But an untracked file can OPTIONALLY be transient
file.IsTransient = true;
}
await _db.SaveChangesAsync();
}
}