Not persisting state.

[DiegoFHG]

I tried using this library for persisting. However, state is not persisting, and errors show but are not so descriptive.

My main file:

final persistor = Persistor<AppState>(
  storage: FlutterStorage(),
  serializer: JsonSerializer<AppState>(AppState.fromJson),
  debug: true
);

AppState initialState;

Store<AppState> store;

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  initialState = await persistor.load();

  store = Store<AppState>(
    reducer,
    initialState: initialState,
    middleware: [persistor.createMiddleware()]
  );

  final HttpLink httpLink = HttpLink(
    uri: 'http://192.168.1.200:3000/dev/graphql'
  );

  final AuthLink authLink = AuthLink(
    getToken: () => 'Bearer ${store.state.authToken}'
  );

  final Link link = authLink.concat(httpLink);

  getIt.registerSingletonAsync<ApiClient>(() async {
    final apiClient = ApiClient(
      client: GraphQLClient(
        cache: InMemoryCache(),
        link: link,
      ),
    );

    return apiClient;
  });

  BlocSupervisor.delegate = SimpleBlocDelegate();

  runApp(App(store: store));
}

AppState:

class AppState {
  List<Item> cart;
  String authToken;
  CognitoUser user;

  AppState({ this.cart, this.authToken, this.user });

  AppState.fromAppState(AppState another) {
    cart = another.cart;
    authToken = another.authToken;
    user = another.user;
  }

  double get cartTotal {
    double total = 0.00;

    if (this.cart == null) return 0.00;

    for (Item item in this.cart) {
      total += item.price;
    }

    return total;
  }

  static AppState fromJson(appState) {
    if (appState != null)
      return AppState(
        authToken: appState['authToken'],
        user: CognitoUser(
          appState['user']['username'],
          CognitoUserPool(
            'XX-XX-XXXXXXX',
            'XXXXXXXXXXXXXXX'
          )
        )
    );

    return AppState();
  }

  dynamic toJson(dynamic json) {
    return {
      "authToken": authToken,
      "user": {
        "username": user.username
      }
    };
  }
}

Logs:

flutter: Persistor debug: Starting save...
flutter: Persistor debug: Running save transformations
flutter: Persistor debug: Serializing
flutter: Persistor debug: Error while saving: Converting object to an encodable object failed: Instance of 'AppState'
[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: Converting object to an encodable object failed: Instance of 'AppState'
 #0      _JsonStringifier.writeObject (dart:convert/json.dart:659:7)
 #1      _JsonStringStringifier.printOn (dart:convert/json.dart:846:17)
 #2      _JsonStringStringifier.stringify (dart:convert/json.dart:831:5)
 #3      JsonEncoder.convert (dart:convert/json.dart:260:30)
 #4      JsonCodec.encode (dart:convert/json.dart:168:45)
 #5      JsonSerializer.encode (package:redux_persist/src/serialization.dart:28:35)
 #6      Persistor.save (package:redux_persist/src/persistor.dart:155:29)
 #7      Persistor.createMiddleware.<anonymous closure>.<anonymous closure>(package:redux_persist/src/persistor.dart:67:56)
 #8      _rootRun (dart:async/zone.dart:1180:38)
 #9      _CustomZone.run (dart:async/zone.dart:1077:19)
 #10     _CustomZone.runGuarded (dart:async/zone.dart:979:7)
 #11     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1019:23)
 #12     _rootRun (dart:asy<…>

I'm testing on iOS.

[DiegoFHG]

So I was not making the right mutation on login, so now is fixed. And the above error was due to trying to persist empty state.