Add multiple genres to MediaFile

persistence/sql_genres.go

@@ -0,0 +1,56 @@
+package persistence
+
+import (
+	. "github.com/Masterminds/squirrel"
+	"github.com/navidrome/navidrome/model"
+)
+
+func (r *sqlRepository) updateGenres(id string, tableName string, genres model.Genres) error {
+	var ids []string
+	for _, g := range genres {
+		ids = append(ids, g.ID)
+	}
+	del := Delete(tableName + "_genres").Where(
+		And{Eq{tableName + "_id": id}, Eq{"genre_id": ids}})
+	_, err := r.executeSQL(del)
+	if err != nil {
+		return err
+	}
+
+	if len(genres) == 0 {
+		return nil
+	}
+	ins := Insert(tableName+"_genres").Columns("genre_id", tableName+"_id")
+	for _, g := range genres {
+		ins = ins.Values(g.ID, id)
+	}
+	_, err = r.executeSQL(ins)
+	return err
+}
+
+func (r *sqlRepository) loadMediaFileGenres(mfs *model.MediaFiles) error {
+	var ids []string
+	m := map[string]*model.MediaFile{}
+	for i := range *mfs {
+		mf := &(*mfs)[i]
+		ids = append(ids, mf.ID)
+		m[mf.ID] = mf
+	}
+
+	sql := Select("g.*", "mg.media_file_id").From("genre g").Join("media_file_genres mg on mg.genre_id = g.id").
+		Where(Eq{"mg.media_file_id": ids}).OrderBy("mg.media_file_id", "mg.rowid")
+	var genres []struct {
+		model.Genre
+		MediaFileId string
+	}
+
+	err := r.queryAll(sql, &genres)
+	if err != nil {
+		return err
+	}
+	for _, g := range genres {
+		mf := m[g.MediaFileId]
+		mf.Genres = append(mf.Genres, g.Genre)
+	}
+	return nil
+}