autoDispose modifier in riverpod

Question

I have multiple values (in class) in provider and when I use the autoDispose modifier in provider then I want to dispose of only a few values in the provider is it possible to do like this?

I have searched for this on the internet but I didn't find any resources related to this requirement.

final provider = StateProvider((ref) => LoginDetails(
      errorMessage: '', status: 0));

class LoginDetails {
  int status;
  String errorMessage;
  LoginDetails({
    required this.status,
    required this.errorMessage,
  });

  LoginDetails copyWith({
    int? status,
    String? errorMessage,
  }) =>
      LoginDetails(
        status: status ?? this.status,
        errorMessage: errorMessage ?? this.errorMessage,
      );
}

Solution

There is no way to have autoDispose only dispose a few property. autoDispose is all or nothing

On the other hand, using version 2.0.0-dev, you can use ref.onCancel to perform some logic when the last listener is removed – which is available even on providers that are not autoDispose

So you can do:

final provider = Provider((ref) {
  ref.onCancel(() {
    // TODO reset the few properties of your choice
  });

  return SomeState();
});

Comments

[Yeasin Sheikh]

Can you provide minimal-reproducible-example

[Admin]

@YeasinSheikh i have added code.... i want to dispose only errorMessage in the LoginDetails

[Admin]

// TODO reset the few properties of your choice can you please explain it?