Issue with openBox and typeAdapters

I noticed an old closed ticket about the same subject so I opened a new one. My issue is at next comment.

> Getting the same error again. Here is the stacktrace:
>
> ```
> _CastError
> type '_OneByteString' is not a subtype of type 'int' in type cast
> user.g.dart in UserAdapter.read at line 17
> binary_reader_impl.dart in BinaryReaderImpl.read at line 321
> binary_reader_impl.dart in BinaryReaderImpl.readFrame at line 266
> frame_helper.dart in FrameHelper.framesFromBytes at line 16
> frame_io_helper.dart in FrameIoHelper.framesFromFile at line 37
> Called from:
> storage_backend_vm.dart in StorageBackendVm.initialize at line 74
> Called from:
> box_base_impl.dart in BoxBaseImpl.initialize at line 82
> hive_impl.dart in HiveImpl._openBox at line 95
> Called from:
> hive_impl.dart in HiveImpl.openBox at line 112
> main.dart in main._openBoxes at line 30
> Called from:
> main.dart in main at line 42
> Called from: async_patch.dart in _AsyncAwaitCompleter.start
> main.dart in main at line 20
> Called from: hooks.dart in _runMainZoned..
> ```
>
> This is what I do in main.dart
>
>
> ```
> void main() async {
> WidgetsFlutterBinding.ensureInitialized();
>
> Future _openBoxes() async {
> await Hive.initFlutter();
> return Future.wait([
> Hive.openBox('user'),
> Hive.openBox('submenu'),
> ]);
> }
>
> Hive.registerAdapter(UserAdapter(), 1);
> Hive.registerAdapter(SubMenuAdapter(), 2);
> Hive.registerAdapter(MenuTypeAdapter(), 3);
> await _openBoxes();
>
> runApp(
> ChangeNotifierProvider(
> create: (context) => AuthProvider()..init(),
> child: Oregon(),
> ),
> );
> }
> ```
>
>
> User class:
>
> ```
> @HiveType()
> class User extends HiveObject {
> @HiveField(0)
> int userId;
> @HiveField(1)
> int driverId;
> @HiveField(2)
> String name;
> @HiveField(3)
> String email;
> @HiveField(4)
> String password;
> @HiveField(5)
> String authToken;

> @HiveField(6)
> String gsm;
> @HiveField(7)
> String avatarUrl;
>
> @HiveField(8)
> String timeZone;
> @HiveField(9)
> String locale;
> @HiveField(10)
> String language;
>
> User({
> this.userId,
> this.driverId,
> this.name,
> this.email,
> this.password,
> this.authToken,
> this.gsm,
> this.timeZone,
> this.locale,
> this.language,
> this.avatarUrl,
> });
> }
> ```
>
> auto generated UserAdapter:
> The corresponding line in stacktrace for this file is
>
> `userId: fields[0] as int`
>
> ```
> class UserAdapter extends TypeAdapter {
> @override
> User read(BinaryReader reader) {
> var numOfFields = reader.readByte();
> var fields = {
> for (var i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
> };
> return User(
> userId: fields[0] as int,
> driverId: fields[1] as int,
> name: fields[2] as String,
> email: fields[3] as String,
> password: fields[4] as String,
> authToken: fields[5] as String,
> gsm: fields[6] as String,
> timeZone: fields[8] as String,
> locale: fields[9] as String,
> language: fields[10] as String,
> avatarUrl: fields[7] as String,
> );
> }
>
> @override
> void write(BinaryWriter writer, User obj) {
> writer
> ..writeByte(11)
> ..writeByte(0)
> ..write(obj.userId)
> ..writeByte(1)
> ..write(obj.driverId)
> ..writeByte(2)
> ..write(obj.name)
> ..writeByte(3)
> ..write(obj.email)
> ..writeByte(4)
> ..write(obj.password)
> ..writeByte(5)
> ..write(obj.authToken)
> ..writeByte(6)
> ..write(obj.gsm)
> ..writeByte(7)
> ..write(obj.avatarUrl)
> ..writeByte(8)
> ..write(obj.timeZone)
> ..writeByte(9)
> ..write(obj.locale)
> ..writeByte(10)
> ..write(obj.language);
> }
> }
> ```
>
> Do you think this is related to Hive?

_Originally posted by @selimkundakci in https://github.com/hivedb/hive/issues/214#issuecomment-589606229_

Start by reproducing the failure through Hive.openBox in main.dart and trace the value from BinaryReaderImpl.read to user.g.dart's UserAdapter.read, especially fields[0] as int. Compare the serialized User fields with the adapter's reads and determine whether the typeAdapter data is decoded consistently; done means identifying the cause and verifying that opening the box no longer raises the reported cast error.

Written by the indexing model from the issue text.