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I have the following domain model: public class Playlist { public long Id { get; set; } public string Title { get; set; } public virtual ICollection<Song> Songs { get; set; } } public class Song { public long Id { get; set; } public string Name { get; set; } public virtual Playlist Playlist { get; set; } public virtual ICollection<Catalog> Matches { get; set; } } public class Catalog { public long Id { get; set; } public string Title { get; set; } } My service has the following code: public PlaylistResult FindByPlaylistId(long id) { Playlist playlist = playlistRepository.GetById(id); foreach (var song in playlist.Songs) { song.Matches = catalogRepository.GetMatches(song.Name).ToList(); } return new PlaylistResult(new PlaylistDTO(playlist), playlist.Songs.Select(x => new SongDTO(x))); } My service gets a playlist and songs from the database and then for each song in the playlist it fires a query to get additional matches from the database (using SQL Server full text search) specific to that song. The data is then converted into DTO's, added to a result object and passed back to the controller. The code looks like: public class PlaylistResult { public PlaylistResult(PlaylistDTO playlist, IEnumerable<SongDTO> songs) { Playlist = playlist; Songs = songs; } public PlaylistDTO Playlist { get; private set; } public IEnumerable<SongDTO> Songs { get; private set; } } The problem: The PlaylistResult object has worked great so far but the recent introduction of matches has made things a bit more complicated. It looks like I have no other choice than to modify my SongDTO to take into account matches and look like this: public class SongDTO { public SongDTO(Song song, IEnumerable<CatalogDTO> matches)

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