HiveError: There is already a TypeAdapter

Question

I'm currently implementing Hive in my FlutterApp. Unfortunately this error pops up all the time:

HiveError: There is already a TypeAdapter for typeId 100.

This is my object:

@HiveType(typeId: 100)
class ShopList{
  @HiveField(0)
  String name;
  @HiveField(1)
  List<ListProduct> products = List();

  ShopList({this.name, this.products});

That's the AUTO-GENERATED adapter:

class ShopListAdapter extends TypeAdapter<ShopList> {
  @override
  final int typeId = 100;

  @override
  ShopList read(BinaryReader reader) {
    final numOfFields = reader.readByte();
    final fields = <int, dynamic>{
      for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
    };
    return ShopList(
      name: fields[0] as String,
      products: (fields[1] as List)?.cast<ListProduct>(),
    );
  }

  @override
  void write(BinaryWriter writer, ShopList obj) {
    writer
      ..writeByte(2)
      ..writeByte(0)
      ..write(obj.name)
      ..writeByte(1)
      ..write(obj.products);
  }

  @override
  int get hashCode => typeId.hashCode;

  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is ShopListAdapter &&
          runtimeType == other.runtimeType &&
          typeId == other.typeId;
}

I have some other Objects with the typeIds 101 and 102, which throw the same error. The Hive.registerAdapter(ShopListAdapter)); runs in a try-catch-block. So if the adapter were already loaded, the code can just go on, BUT the FutureBuilder-Widget using the value from the Hive loads infinitely long. Do you have any tips?

Answer 1

you need to check typeId, they should be different and unique from other class models even in same file.

@HiveType(typeId: 0)
class Module1 {}

@HiveType(typeId: 1)
class Module2 {}

Once typeId has been changed then

reinstall the app,
delete .g.dart generated file,
run command ---> flutter packages pub run build_runner build