internal void CalculateUpdatedArtists(Song old, MintPlayer.Dtos.Dtos.Song @new, MintPlayerContext dbContext, out IEnumerable <ArtistSong> to_add, out IEnumerable <ArtistSong> to_update, out IEnumerable <ArtistSong> to_remove)
{
// Compute artists to remove
var en_to_remove = old.Artists.Where(@as =>
{
if (@new.Artists.Any(a => a.Id == @as.ArtistId))
{
return(false);
}
if (@new.UncreditedArtists.Any(a => a.Id == @as.ArtistId))
{
return(false);
}
return(true);
});
// Compute artists to add
var en_to_add = @new.Artists
.Select(a => new { ArtistId = a.Id, Credited = true })
.Concat(@new.UncreditedArtists.Select(a => new { ArtistId = a.Id, Credited = false }))
.Where(a => !old.Artists.Any(@as => @as.ArtistId == a.ArtistId))
.Select(a => new ArtistSong
{
Artist = dbContext.Artists.Find(a.ArtistId),
ArtistId = a.ArtistId,
Song = old,
SongId = old.Id,
Credited = a.Credited
});
// Compute artists to update
var en_to_update = old.Artists.Except(en_to_remove);
foreach (var item in en_to_update)
{
if (@new.Artists.Any(a => a.Id == item.ArtistId))
{
item.Credited = true;
}
else if (@new.UncreditedArtists.Any(a => a.Id == item.ArtistId))
{
item.Credited = false;
}
else
{
throw new Exception("Not supposed to happen");
}
}
to_remove = en_to_remove.ToArray();
to_add = en_to_add.ToArray();
to_update = en_to_update.ToArray();
}
internal void CalculateUpdatedArtists(Song old, MintPlayer.Dtos.Dtos.Song @new, MintPlayerContext dbContext, out IEnumerable <ArtistSong> to_add, out IEnumerable <ArtistSong> to_update, out IEnumerable <ArtistSong> to_remove)
{
to_remove = old.Artists
.Where(@as => [email protected](a => a.Id).Contains(@as.ArtistId))
.ToArray();
to_add = @new.Artists
.Where(a => !old.Artists.Select(@as => @as.ArtistId).Contains(a.Id))
.Select(a => new ArtistSong(dbContext.Artists.Find(a.Id), old))
.ToArray();
to_update = old.Artists
.Except(to_remove)
.ToArray();
}
