Create relation table for playlist tracks

db/migration/20200516140647_add_playlist_tracks_table.go

@@ -0,0 +1,100 @@
+package migration
+
+import (
+	"database/sql"
+	"strings"
+
+	"github.com/deluan/navidrome/log"
+	"github.com/pressly/goose"
+)
+
+func init() {
+	goose.AddMigration(Up20200516140647, Down20200516140647)
+}
+
+func Up20200516140647(tx *sql.Tx) error {
+	_, err := tx.Exec(`
+create table if not exists playlist_tracks
+(
+	id integer default 0 not null, 
+    playlist_id varchar(255) not null, 
+	media_file_id varchar(255) not null
+);
+
+create unique index if not exists playlist_tracks_pos
+	on playlist_tracks (playlist_id, id);
+`)
+	if err != nil {
+		return err
+	}
+	rows, err := tx.Query("select id, tracks from playlist")
+	if err != nil {
+		return err
+	}
+	defer rows.Close()
+	var id, tracks string
+	for rows.Next() {
+		err := rows.Scan(&id, &tracks)
+		if err != nil {
+			return err
+		}
+		err = Up20200516140647UpdatePlaylistTracks(tx, id, tracks)
+		if err != nil {
+			return err
+		}
+	}
+	err = rows.Err()
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.Exec(`
+create table playlist_dg_tmp
+(
+	id varchar(255) not null
+		primary key,
+	name varchar(255) default '' not null,
+	comment varchar(255) default '' not null,
+	duration real default 0 not null,
+	song_count integer default 0 not null,
+	owner varchar(255) default '' not null,
+	public bool default FALSE not null,
+	created_at datetime,
+	updated_at datetime
+);
+
+insert into playlist_dg_tmp(id, name, comment, duration, owner, public, created_at, updated_at) 
+	select id, name, comment, duration, owner, public, created_at, updated_at from playlist;
+
+drop table playlist;
+
+alter table playlist_dg_tmp rename to playlist;
+
+create index playlist_name
+	on playlist (name);
+
+update playlist set song_count = (select count(*) from playlist_tracks where playlist_id = playlist.id)
+where id <> ''
+
+`)
+	return err
+}
+
+func Up20200516140647UpdatePlaylistTracks(tx *sql.Tx, id string, tracks string) error {
+	trackList := strings.Split(tracks, ",")
+	stmt, err := tx.Prepare("insert into playlist_tracks (playlist_id, media_file_id, id) values (?, ?, ?)")
+	if err != nil {
+		return err
+	}
+	for i, trackId := range trackList {
+		_, err := stmt.Exec(id, trackId, i)
+		if err != nil {
+			log.Error("Error adding track to playlist", "playlistId", id, "trackId", trackId, err)
+		}
+	}
+	return nil
+}
+
+func Down20200516140647(tx *sql.Tx) error {
+	return nil
+}