fix linked list: clear the existing next/prev pointer

c9s · Jan 25, 2024 · 81b100a · 81b100a
1 parent 2473c62
commit 81b100a
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Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/migration.go b/migration.go
@@ -287,9 +287,14 @@ func (ms MigrationSlice) Connect() MigrationSlice {
 
 		if i < len(ms)-1 {
 			m.Next = ms[i+1]
+		} else {
+			m.Next = nil
 		}
+
 		if i > 0 {
 			m.Previous = ms[i-1]
+		} else {
+			m.Previous = nil
 		}
 
 		ms[i] = m

diff --git a/up.go b/up.go
@@ -26,7 +26,7 @@ func Upgrade(ctx context.Context, db *DB, migrations MigrationSlice) error {
 	migrationMap := migrations.MapByPackage()
 	for _, pkgMigrations := range migrationMap {
 		pkgMigrations = pkgMigrations.Sort().Connect()
-	
+
 		_, lastAppliedMigration, err := db.FindLastAppliedMigration(ctx, pkgMigrations)
 		if err != nil {
 			return err