Observable is deprecated in rxdart 0.23.1

Question

I just upgraded to rxdart 0.23.1 and suddenly I am getting errors wherever I have used the Observable class. I have read about the breaking changes in the documentation and it has specified to use the rxdart_codemod package which I have integrated in my pubspec.yaml file and running the following command pub global activate rxdart_codemod throws the -bash: pub: command not found error. I have installed flutter properly and flutter doctor also seems to be running fine. Is there some other class that have replace Observable, couldn't find anything about it in the docs. Of course I can replace the Observable with the Stream from Dart language but really interested to know what path does the rxdart package takes as it specifies it is taking advantage of the dart extension.Using methods like combineLatest2 is not possible with Dart's Stream so it won't be a good choice for replacement?

score 82 · Accepted Answer · answered Dec 15 '19 at 06:21

82

The Observable can be replaced by Stream as I mentioned in the question but if you are using methods like combineLatest2 from Observable, then just replace Observable by abstract class Rx so you can use Rx.combineLatest2

answered Dec 15 '19 at 06:21

BraveEvidence

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Rémi Rousselet · Answer 2 · 2020-03-11T11:58:26.300

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Rxdart no longer needs a custom class to work.

It now relies on extension methods, which is a recent Dart feature (Dart 2.6) to implement all of the Observable features directly on Stream.

You can safely replace all your Observable by Stream.

edited Mar 11 '20 at 11:58

answered Dec 14 '19 at 15:28

Rémi Rousselet

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Then how do I use methods like combineLatest2 with Stream, that won't be possible – BraveEvidence Dec 14 '19 at 15:57

score 17 · Answer 3 · edited Jun 28 '20 at 02:09

17

Use Rx.combineLatest2 rather than Observable.combineLatest2

Observable no longer work!

edited Jun 28 '20 at 02:09

TuGordoBello

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answered Mar 05 '20 at 20:07

goodBot

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Kartik Shandilya · Answer 4 · 2019-12-14T15:56:15.373

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You can use

flutter pub global activate rxdart_codemod

instead of pub global activate rxdart_codemod.

Another option is to replace your Observable by Stream.

edited Dec 14 '19 at 15:56

answered Dec 14 '19 at 15:29

Kartik Shandilya

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score 4 · Answer 5 · answered Jul 09 '20 at 03:41

rxdart document changelog 0.23.0 :

ValueObservable -> ValueStream
ReplayObservable -> ReplayStream
ConnectableObservable -> ConnectableStream
ValueConnectableObservable -> ValueConnectableStream
ReplayConnectableObservable -> ReplayConnectableStream

score 2 · Answer 6 · answered Apr 18 '20 at 13:03

2

Rxdart now implements it in RX.combineLatest2

answered Apr 18 '20 at 13:03

Franco Macri

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score 2 · Answer 7 · answered Mar 27 '21 at 17:17

In rxdart 0.26.0 I'm using CombineLatestStream<T, R> class with combine2<A, B, R> method:

import 'dart:async';
import 'validators.dart';
import 'package:rxdart/rxdart.dart';

class Bloc extends Validators {
  final _email = StreamController<String>.broadcast();
  final _password = StreamController<String>.broadcast();

  Stream<String> get email => _email.stream.transform(validateEmail);
  Stream<String> get password => _password.stream.transform(validatePassword);
  Stream<bool> get submitValid => CombineLatestStream.combine2(email, password, (email, password) => true);

  Function(String) get changeEmail => _email.sink.add;
  Function(String) get changePassword => _password.sink.add;

  dispose() {
    _email.close();
    _password.close();
  }
}

Observable is deprecated in rxdart 0.23.1

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