fix: render artistId in track types

fixes #170

server/ctrlsubsonic/handlers_by_folder.go

@@ -82,6 +82,7 @@ func (c *Controller) ServeGetMusicDirectory(r *http.Request) *spec.Response {
 	c.DB.
 		Where("album_id=?", id.Value).
 		Preload("Album").
+		Preload("Album.TagArtist").
 		Order("filename").
 		Find(&childTracks)
 	for _, c := range childTracks {

server/ctrlsubsonic/handlers_by_tags.go

@@ -343,6 +343,7 @@ func (c *Controller) ServeGetSongsByGenre(r *http.Request) *spec.Response {
 		Joins("JOIN track_genres ON track_genres.track_id=tracks.id").
 		Joins("JOIN genres ON track_genres.genre_id=genres.id AND genres.name=?", genre).
 		Preload("Album").
+		Preload("Album.TagArtist").
 		Offset(params.GetOrInt("offset", 0)).
 		Limit(params.GetOrInt("count", 10))
 	if m := c.getMusicFolder(params); m != "" {

server/ctrlsubsonic/handlers_common.go

@@ -188,6 +188,7 @@ func (c *Controller) ServeGetSong(r *http.Request) *spec.Response {
 	err = c.DB.
 		Where("id=?", id.Value).
 		Preload("Album").
+		Preload("Album.TagArtist").
 		First(track).
 		Error
 	if errors.Is(err, gorm.ErrRecordNotFound) {
@@ -204,6 +205,7 @@ func (c *Controller) ServeGetRandomSongs(r *http.Request) *spec.Response {
 	q := c.DB.DB.
 		Limit(params.GetOrInt("size", 10)).
 		Preload("Album").
+		Preload("Album.TagArtist").
 		Joins("JOIN albums ON tracks.album_id=albums.id").
 		Order(gorm.Expr("random()"))
 	if year, err := params.GetInt("fromYear"); err == nil {
@@ -219,7 +221,9 @@ func (c *Controller) ServeGetRandomSongs(r *http.Request) *spec.Response {
 	if m := c.getMusicFolder(params); m != "" {
 		q = q.Where("albums.root_dir=?", m)
 	}
-	q.Find(&tracks)
+	if err := q.Find(&tracks).Error; err != nil {
+		return spec.NewError(10, "get random songs: %v", err)
+	}
 	sub := spec.NewResponse()
 	sub.RandomTracks = &spec.RandomTracks{}
 	sub.RandomTracks.List = make([]*spec.TrackChild, len(tracks))

server/ctrlsubsonic/handlers_playlist.go

@@ -32,6 +32,7 @@ func playlistRender(c *Controller, playlist *db.Playlist) *spec.Playlist {
 		err := c.DB.
 			Where("id=?", id).
 			Preload("Album").
+			Preload("Album.TagArtist").
 			Find(&track).
 			Error
 		if errors.Is(err, gorm.ErrRecordNotFound) {