Question about use of Future Signal.

[iSaqibShafique]

If we need to change the value of FutureSignal then how we can do this,I have searched all across the web, but haven't find any solution, like this.

FutureSignal<SignupStatus> loginSignal =
      FutureSignal(() async => SignupStatus.initial, autoDispose: true);

  void login(BuildContext context,
      {required String email, required String password}) {
    if (key.currentState!.validate()) {
      loginSignal = FutureSignal(() async {
        FirebaseAuth auth = FirebaseAuth.instance;
        UserCredential cred = await auth.createUserWithEmailAndPassword(
            email: email, password: password);
        if (cred.user != null) {
          await cred.user!.sendEmailVerification();
          // ignore: use_build_context_synchronously
          GoRouter.of(context).pushReplacementNamed(AppRoutes.emailverification,
              extra: {"user": cred.user});
          return SignupStatus.success;
        } else {
          return SignupStatus.error;
        }
      });
    }

[rodydavis]

Why not put that logic inside the future signal? This is create a new signal every time that will break subscribers.

If you want to do it manually there is also AsyncSignal

[iSaqibShafique]

@rodydavis

Why I'm getting this error :

flutter: signal warning: [4|null] has been read after disposed: #0 Signal.value (package:signals_core/src/core/signal.dart:292:97)
#1 watchSignal (package:signals_flutter/src/watch/extension.dart:10:46)
#2 FlutterReadonlySignalUtils.watch (package:signals_flutter/src/extensions/signal.dart:15:12)
#3 _EmailSignupState.intialState (package:dating/view/email_signup/view.dart:108:50)
#4 _EmailSignupState.build. (package:dating/view/email_signup/view.dart:71:22)
#5 _WatchState.rebuild (package:signals_flutter/src/watch/widget.dart:196:34)
#6 _WatchState.build. (package:signals_flutter/src/watch/widget.dart:219:11)
#7 Effect._callback (package:signals_core/src/core/effect.dart:350:32)
#8 _endBatch (package:signals_core/src/core/batch.dart:29:18)
#9 Signal.set (package:signals_core/src/core/signal.dart:269:9)
#10 Signal.value= (package:signals_core/src/core/signal.dart:284:5)
#11 EmailSignupController.onRet<…>

When doing these changes : void onRetry() {
loginSignal.value = const AsyncData(null);
}

[rodydavis]

Because autoDispose is set to true, try removing that

[iSaqibShafique]

Same issue, I've tried removing autoDispose and set the autoDispose to false, but same issue occurs.

[rodydavis]

Can you provide a minimal code example to reproduce the issue?

[rodydavis]

Also try hot restart instead of hot reload to see if the issue still persists

[rodydavis]

If you are looking to pass args to update a future signal then you need to use computedAsync and computedFrom