fix(11-08): bind nested callbacks to parent transaction

modules/lagoon/transaction_test.go

@@ -146,6 +146,39 @@ func TestTransactionAfterCommit(t *testing.T) {
 		}
 	})
 
+	t.Run("nested_rejects_unrelated_transaction_handle", func(t *testing.T) {
+		var r recorder
+		err := Transaction(ctx, gdb, func(ctx context.Context, _ *gorm.DB) error {
+			foreign := gdb.WithContext(ctx).Begin()
+			if foreign.Error != nil {
+				return foreign.Error
+			}
+			defer foreign.Rollback()
+			entered := false
+			err := Transaction(ctx, foreign, func(ctx context.Context, tx *gorm.DB) error {
+				entered = true
+				AfterCommit(ctx, tx, func(context.Context, *gorm.DB) { r.add("foreign") })
+				return tx.Create(&acItem{Name: "foreign-nested"}).Error
+			})
+			if err == nil || !strings.Contains(err.Error(), "parent transaction handle") {
+				t.Fatalf("unrelated nested handle err = %v", err)
+			}
+			if entered {
+				t.Fatal("unrelated nested transaction entered fn")
+			}
+			return nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if got := r.names(); len(got) != 0 {
+			t.Fatalf("callbacks = %v, want none", got)
+		}
+		if committedCount(t, db, "foreign-nested") != 0 {
+			t.Fatal("unrelated nested transaction committed work")
+		}
+	})
+
 	t.Run("panicking_callback_does_not_fail_commit", func(t *testing.T) {
 		var r recorder
 		err := Transaction(ctx, gdb, func(ctx context.Context, tx *gorm.DB) error {