Flutter - ObjectBox - All data removed

[EmixamZ]

Is there an existing issue?

• I have searched existing issues
• Stackoverflow : https://stackoverflow.com/questions/79269705/flutter-objectbox-all-data-removed

Build info

• objectbox version: 4.0.2
• Flutter/Dart version:
  Flutter 3.24.5 • channel stable • https://github.com/flutter/flutter.git
  Framework • revision dec2ee5c1f (5 weeks ago) • 2024-11-13 11:13:06 -0800
  Engine • revision a18df97ca5
  Tools • Dart 3.5.4 • DevTools 2.37.3
• Build OS: macOS 15.2

Steps to reproduce

1. Initialize ObjectBox and store data
2. Execute : flutter build apk --release; flutter install
3. Close the app
4. Re-execute step 2
5. Empty storage

Expected behavior

Data should be persisted.

Actual behavior

Data are not persisted

Code

Code

import 'package:flutter_riverpod/flutter_riverpod.dart';
// ignore: depend_on_referenced_packages
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';
import 'package:appName/objectbox.g.dart';

class ObjectBox {
  /// The Store of this app.
  late final Store store;

  ObjectBox._create(this.store) {
    // Add any additional setup code, e.g. build queries.
  }

  /// Create an instance of ObjectBox to use throughout the app.
  static Future<ObjectBox> create() async {
    final docsDir = await getApplicationSupportDirectory();
    // Future<Store> openStore() {...} is defined in the generated objectbox.g.dart
    final store = await openStore(directory: p.join(docsDir.path, "appName"));
    return ObjectBox._create(store);
  }
}

final objectBoxProvider =
    Provider<ObjectBox>((ref) => throw UnimplementedError());

/// ... Into main

var o = await ObjectBox.create();
  runApp(
    ProviderScope(
      overrides: [objectBoxProvider.overrideWithValue(o)],
      child: App(),
    ),
  );

Notes

Somehow I might be related to the folder where the app is installed. It looks like object box database is stored under the container/{containerId} folder which changes everytime.

[greenrobot-team]

Are you saying that getApplicationSupportDirectory or getApplicationDocumentsDirectory change every time your app runs? Then this is a Flutter bug, not an ObjectBox issue.

Note that these folders get removed when uninstalling an app on Android.

If you have more details on why this is an ObjectBox issue, please comment.

Note: I labeled this issue with "more info required" so it will auto-close in a few days if there are no follow-up comments.

[EmixamZ]

Hey,

I think it might be a little of both, since the documentation from objectBox is using the exact same function : https://docs.objectbox.io/getting-started#create-a-store.

[greenrobot-team]

How so? The ObjectBox docs use getApplicationDocumentsDirectory, which is preserved on app upgrades on Android.

Note: I labeled this issue with "more info required" so it will auto-close in a few days if there are no follow-up comments.