Unions inheritance

[zs-dima]

It could be nice to use Unions for the BLOC states
But states usually have inheritance:

abstract class AppState {}
abstract class AppNavigationState {}
class AppNavigateToAState extends AppState with AppNavigationState {}
class AppNavigateToBState extends AppState with AppNavigationState {}
class AppSomeOtherState extends AppState {}

so we could filter states after:

.appBloc.whereType<AppNavigationState>()

so it could befreezed freezedWith attribute for example:

abstract class AppNavigationState {}

@freezed
abstract class AppState with _$Union {
  @freezedWith(AppNavigationState)
  const factory AppState.navigateToA() = NavigateToA;
  @freezedWith(AppNavigationState)
  const factory AppState.navigateToB() = NavigateToB;
}

[rrousselGit]

And how do you plan on implementing the interface?

[zs-dima]

And how do you plan on implementing the interface?

In the example just AppNavigationState inheritance, to filter out BLOC states by whereType() later

[rrousselGit]

That's not what I meant.
If the interface has properties and methods, how will you implement these?

[zs-dima]

If the interface has properties and methods

properties and methods are not usually used for BLOC for the case I described

[rrousselGit]

Added as part of 0.11.0

[fernando-s97]

Is it possible to use something like:

abstract class GenericFailure {}

@freezedWith(GenericFailure)
abstract class SpecificFailure with _$SpecificFailure {
  const factory SpecificFailure.A() = A;
  const factory SpecificFailure.B() = B;
}

[rrousselGit]

No, it is not possible

[fernando-s97]

Thanks!

[petrnymsa]

Hi, sorry to "reopen" old issue, but how exactly mentioned version 0.11.0 solves this?