Bloc: on v5 how can create Singleton pattern Bloc class ?

[kiaxseventh]

hello again dear @felangel
thank you for new release of bloc

on migration from v4 to v5 i have one problem on Bloc classes with Singleton pattern

Before:

class SingletonBloc extends Bloc<SingletonEvent, int> {

  SingletonBloc._internal();

  static final SingletonBloc _instance = SingletonBloc._internal();

  factory SingletonBloc() {
    return _instance;
  }

 @override
  int get initialState => 0;

}

After:

class SingletonBloc extends Bloc<SingletonEvent, int> {

  SingletonBloc._internal();

  static final SingletonBloc _instance = SingletonBloc._internal();

  factory SingletonBloc() {
    return _instance;
  }

   SingletonBloc() : super(0);

}

This new style of v5 interferes with factory method

are you have any solution or idea ?

thank you

[Jomik]

You should remove the public constructor and simply call super(0) in SingletonBloc._internal().

class SingletonBloc extends Bloc<SingletonEvent, int> {

  SingletonBloc._internal() : super(0);

  static final SingletonBloc _instance = SingletonBloc._internal();

  factory SingletonBloc() {
    return _instance;
  }
}

[felangel]

Hi @kiaxseventh 👋
Thanks for opening an issue!

As @Jomik mentioned you can call super now with the initial state rather than overriding the old initialState getter. Check out the migration guide for more details 👍