Changed the db to represent compilations. By default a track will have a single albumId and a list of artistIds. If the album is a compilation, we will use Various Artists to align with Plex, iTunes, and Amazon.

src/NzbDrone.Core/Datastore/Migration/111_setup_music.cs

@@ -30,12 +30,11 @@ namespace NzbDrone.Core.Datastore.Migration
                 ;
 
             Create.TableForModel("Albums")
-                .WithColumn("AlbumId").AsInt32() // Does this map to collectionId?
-                .WithColumn("CompilationId").AsInt32()
-                .WithColumn("Compilation").AsBoolean()
+                .WithColumn("AlbumId").AsInt32()
+                .WithColumn("ArtistId").AsInt32()
                 .WithColumn("Title").AsString()
                 .WithColumn("Year").AsInt32()
-                .WithColumn("Image").AsInt32() // Is this needed?
+                .WithColumn("Image").AsInt32()
                 .WithColumn("TrackCount").AsInt32()
                 .WithColumn("DiscCount").AsInt32()
                 .WithColumn("Monitored").AsBoolean();
@@ -43,8 +42,7 @@ namespace NzbDrone.Core.Datastore.Migration
             Create.TableForModel("Tracks")
                 .WithColumn("ItunesTrackId").AsInt32().Unique()
                 .WithColumn("AlbumId").AsInt32()
-                .WithColumn("CompilationId").AsInt32().Nullable()
-                .WithColumn("Compilation").AsBoolean().WithDefaultValue("False")
+                .WithColumn("ArtistsId").AsString().Nullable()
                 .WithColumn("TrackNumber").AsInt32()
                 .WithColumn("Title").AsString().Nullable()
                 .WithColumn("Ignored").AsBoolean().Nullable()
@@ -53,10 +51,7 @@ namespace NzbDrone.Core.Datastore.Migration
                 .WithColumn("TrackCensoredName").AsString().Nullable()
                 .WithColumn("TrackFileId").AsInt32().Nullable()
                 .WithColumn("ReleaseDate").AsDateTime().Nullable();
-            //.WithColumn("AbsoluteEpisodeNumber").AsInt32().Nullable()
-            //.WithColumn("SceneAbsoluteEpisodeNumber").AsInt32().Nullable()
-            //.WithColumn("SceneSeasonNumber").AsInt32().Nullable()
-            //.WithColumn("SceneEpisodeNumber").AsInt32().Nullable();
+
 
             Create.TableForModel("TrackFiles")
                   .WithColumn("ArtistId").AsInt32()
@@ -66,9 +61,6 @@ namespace NzbDrone.Core.Datastore.Migration
                   .WithColumn("DateAdded").AsDateTime()
                   .WithColumn("AlbumId").AsInt32(); // How does this impact stand alone tracks?
 
-            Create.TableForModel("Compilation")
-                   .WithColumn("CompilationId").AsInt32().Unique()
-                   .WithColumn("ArtistId").AsString().Nullable();
         }
 
     }

src/NzbDrone.Core/Datastore/TableMapping.cs

@@ -103,17 +103,14 @@ namespace NzbDrone.Core.Datastore
                   .For("Tracks")
                   .LazyLoad(condition: parent => parent.Id > 0,
                             query: (db, parent) => db.Query<Track>().Where(c => c.ItunesTrackId == parent.Id).ToList())
-                  .HasOne(file => file.Artist, file => file.AlbumId);
+                  .HasOne(file => file.Artist, file => file.AlbumId); 
 
             Mapper.Entity<Track>().RegisterModel("Tracks")
                   //.Ignore(e => e.SeriesTitle)
                   .Ignore(e => e.Album)
                   .Ignore(e => e.HasFile)
                   .Relationship()
-                  .HasOne(track => track.TrackFile, track => track.TrackFileId);
-
-            Mapper.Entity<Compilation>().RegisterModel("Compilation")
-                   .Relationships.AutoMapICollectionOrComplexProperties(); //TODO: Figure out how to map this Table
+                  .HasOne(track => track.TrackFile, track => track.TrackFileId); // TODO: Check lazy load for artists
 
             Mapper.Entity<QualityDefinition>().RegisterModel("QualityDefinitions")
                   .Ignore(d => d.Weight);

src/NzbDrone.Core/Music/Track.cs

@@ -19,6 +19,7 @@ namespace NzbDrone.Core.Music
 
         public int ItunesTrackId { get; set; }
         public int AlbumId { get; set; }
+        public LazyLoaded<Artist> ArtistsId { get; set; }
         public int CompilationId { get; set; }
         public bool Compilation { get; set; }
         public int TrackNumber { get; set; }