Flutter model: 3.13.9
isar model: ^3.1.0+1
After the creation of an entity within the software all the pieces it’s working nice and the objects are displayed till the applying it’s faraway from processes (faraway from foreground). The issue that we encounter is that the entities will not be displayed anymore after the applying is faraway from foreground.
That is solely taking place on the bodily iPhone units.
On the iPhone simulator and Android simulator or bodily units all the pieces works as anticipated.
Bellow it’s a code snippet containing all the important thing elements of the implementation.
import 'bundle:flutter/materials.dart';
import 'bundle:supplier/supplier.dart';
import 'bundle:isar/isar.dart';
import 'bundle:path_provider/path_provider.dart';
import 'bundle:my_app/fashions/local_db.dart';
import 'dart:convert';
import 'dart:async';
/// mannequin from my_app/fashions/local_db.dart - begin
half 'local_db.g.dart';
@assortment
class LocalDb {
Id id = Isar.autoIncrement;
Checklist<int>? db;
}
/// mannequin from my_app/fashions/local_db.dart - finish
class DataBase {
Checklist favoriteFolders;
Checklist archivedFolders;
DataBase({
required this.favoriteFolders,
required this.archivedFolders,
});
}
class GeneralAppState extends ChangeNotifier {
DataBase dataBase = DataBase(
favoriteFolders: [],
archivedFolders: [],
);
Future<Isar> getIsar() async {
if (Isar.instanceNames.isEmpty) {
last dir = await getApplicationDocumentsDirectory();
return await Isar.open(
[LocalDbSchema],
listing: dir.path,
);
}
return Future.worth(Isar.getInstance());
}
Future<void> createOrLoadDataBase() async {
await Future.delayed(const Period(seconds: 1));
last Isar isar = await getIsar();
last existingDb = await isar.localDbs.the place().findFirst();
if (existingDb != null) {
// LOAD DATABASE
decodeDb(existingDb.db!);
} else {
// CREATE DATABASE
last newDataBase = LocalDb()..db = encodeDb(dataBase);
await isar.writeTxn(() async {
await isar.localDbs.put(newDataBase);
});
}
}
Checklist<int> encodeDb(DataBase db) {
return utf8.encode(jsonEncode({
'favoriteFolders': db.favoriteFolders,
'archivedFolders': db.archivedFolders,
}));
}
void decodeDb(Checklist<int> bytes) {
last db = jsonDecode(utf8.decode(bytes));
dataBase.favoriteFolders = db['favoriteFolders'];
dataBase.archivedFolders = db['archivedFolders'];
}
}
void principal() async {
WidgetsFlutterBinding.ensureInitialized();
runApp(
MultiProvider(
suppliers: [
ChangeNotifierProvider(create: (_) => GeneralAppState()),
/// other providers
],
little one: const MyApp(),
),
);
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : tremendous(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
last StreamController<bool> localStorageInitializationControoler = StreamController<bool>.broadcast();
@override
void initState() {
localStorageInitializationControoler.stream.hear((occasion) async {
if (occasion) {
attempt {
await context.learn<GeneralAppState>().createOrLoadDataBase();
} catch (e) {
/// error handleling
}
}
});
openDb(true);
tremendous.initState();
}
void openDb(bool occasion) {
localStorageInitializationControoler.add(occasion);
}
@override
Widget construct(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
house: Scaffold(
appBar: AppBar(
title: const Textual content('My software'),
),
physique: Container(
/// Checklist favourite folders
),
),
);
}
}
Executing a CRUD utilizing flutter isar on native storage wanted for iOS and android purposes. Every part works nice in iOS simulator and Android simulator/bodily units however when testing the applying on bodily iPhone machine the created entities will not be continued to native storage as a result of they disappear after the applying is faraway from foreground processes.