App does not start after removing a nested object

[bw-flagship]

Description
When removing a nested object in hive that was filled with data before, the app does not start any longer.
I found it in my production app first and could reproduce it in a minimal sample.

Steps to Reproduce

• Use Code sample for first Run
• run flutter pub run build_runner build
• run the app
• Use Code sample for second Run
• run flutter pub run build_runner build
• run the app

Actual result
HiveError: Cannot read, unknown typeId: 34. Did you forget to register an adapter?
(App does not start)

Expected result
App starts and is usable

Code sample for first Run

import 'package:flutter/material.dart';
import 'package:hive_flutter/hive_flutter.dart';

part 'main.g.dart';

void main() async {
  await Hive.initFlutter();

  Hive.registerAdapter(MyClassAdapter());
  Hive.registerAdapter(MyClass2Adapter());
  final box = await Hive.openBox<MyClass>("boxname");
  await box.clear();
  await box.add(
    MyClass()
      ..a = 1
      ..b =MyClass2()..a=7
      ..c = 3,
  );
  print("count: ${box.values.length}");

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(),
    );
  }
}

@HiveType(typeId: 1)
class MyClass {
  @HiveField(0)
  int? a;
  @HiveField(1)
  MyClass2? b;
  @HiveField(2)
  int? c;
}

@HiveType(typeId: 2)
class MyClass2 {
  @HiveField(0)
  int? a;
}

Code sample for second Run

import 'package:flutter/material.dart';
import 'package:hive_flutter/hive_flutter.dart';

part 'main.g.dart';

void main() async {
  await Hive.initFlutter();

  Hive.registerAdapter(MyClassAdapter());
  // Hive.registerAdapter(MyClass2Adapter());
  final box = await Hive.openBox<MyClass>("boxname");
  await box.clear();
  // await box.add(
  //   MyClass()
  //     ..a = 1
  //     ..b =MyClass2()..a=7
  //     ..c = 3,
  // );
  print("count: ${box.values.length}");

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(),
    );
  }
}

@HiveType(typeId: 1)
class MyClass {
  @HiveField(0)
  int? a;
  // @HiveField(1)
  // MyClass2? b;
  @HiveField(2)
  int? c;
}

// @HiveType(typeId: 2)
// class MyClass2 {
//   @HiveField(0)
//   int? a;
// }

Version

• Platform: Android
• Flutter version: [3.22]
• Hive version: [2.2.3]

[bw-flagship]

Mirrored in hive repo:
isar/hive#1321

[Rexios80]

Use Hive.ignoreTypeId to solve this

[bw-flagship]

@Rexios80 Thanks! This fixes it in my sample, so it seems to be the right approach. However, in my real world application, it does not work. Do you have any idea what I could try?

[Rexios80]

I do not have any idea unless you are opening the box before making the ignore call

[bw-flagship]

Okay, thanks. Than I'll close this issue since I can't provide a sample to reproduce