Add discs to album

db/migration/20231208182311_add_discs_to_album.go

@@ -0,0 +1,36 @@
+package migrations
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/pressly/goose/v3"
+)
+
+func init() {
+	goose.AddMigrationContext(upAddDiscToAlbum, downAddDiscToAlbum)
+}
+
+func upAddDiscToAlbum(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, `alter table album add discs JSONB default '{}';`)
+	if err != nil {
+		return err
+	}
+	_, err = tx.ExecContext(ctx, `
+update album set discs = t.discs
+from (select album_id, json_group_object(disc_number, disc_subtitle) as discs
+      from (select distinct album_id, disc_number, disc_subtitle
+            from media_file
+            where disc_number > 0
+            order by album_id, disc_number)
+      group by album_id
+      having discs <> '{"1":""}') as t
+where album.id = t.album_id;
+`)
+	return err
+}
+
+func downAddDiscToAlbum(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, `alter table album drop discs;`)
+	return err
+}