[firebase_firestore]: Stream does not load value, but future does on web

[Albert-Jan]

Is there an existing issue for this?

• [X] I have searched the existing issues.

Which plugins are affected?

Cloud Firesotre

Which platforms are affected?

Web

Description

After updating Flutter Firestore from version 4.X to 5.X, the web version, the stream no longer emits a value. Downgrading makes the same code work as expected. The future of the same document works without a problem.

Reproducing the issue

Listen to a stream:

Stream<Project> listenProject(String projectId) => _service.doc(FirestorePath.project(projectId)).snapshots().map((DocumentSnapshot<Map<String, dynamic>> data) => Project.fromMap(data.data()!));

Future loads just fine: Future<Project> getProject(String projectId) async => _service.doc(FirestorePath.project(projectId)).get().then((DocumentSnapshot<Map<String, dynamic>> data) => Project.fromMap(data.data()!));

Firebase Core version

3.1.1

Flutter Version

3.22.2

Relevant Log Output

No error is thrown, even when wrapped with try/catch

Flutter dependencies

No response

Additional context and comments

No response

[TarekkMA]

@Albert-Jan Thank you for reporting this issue. I've replicated the code for the example Firestore app in this branch: issue/13019, and I didn't find any issues. Can you try this branch and see if you still have problems?

[Albert-Jan]

Thanks for your response; I updated my pubspec to rely on the cloud_firestore of the custom branch. I also performed a flutter clean to make sure it was properly compiled.

cloud_firestore: git: url: https://github.com/firebase/flutterfire.git ref: issue/13019 # branch name path: packages/cloud_firestore/cloud_firestore

Unfortunately, it did not work as expected, and the same bug happened. I double checked and downgrading to cloud_firestore: 4.17.4 does work as expected without any code changes.

[TarekkMA]

Can you try running the example app found at this branch and test it with the provided configuration? Then, integrate your Firebase configuration into the example app and test again.

[russellwheatley]

Hey @Albert-Jan - I think I was able to reproduce, fairly sure it is the same as this issue: https://github.com/firebase/flutterfire/pull/13029

[Albert-Jan]

I had a quick look. This might be the problem. Is there a branch I can test this against?

[russellwheatley]

@Albert-Jan Sure, do you mind testing this branch to see if it fixes your issue, please? https://github.com/firebase/flutterfire/tree/firestore-13019

Let me know how it goes 🙏

[russellwheatley]

For testing, I think updating pubspec.yaml to something like this ought to work:

dependencies:
  cloud_firestore_web:
    git:
      url: https://github.com/FirebaseExtended/flutterfire.git
      ref: firestore-13019
      path: packages/cloud_firestore/cloud_firestore_web

[russellwheatley]

@Albert-Jan - did you have a chance to test this?

[alextekartik]

I still have the issue where registering twice to the same document simply does not work on the web (in debug mode at least)

• It does not work using cloud_firestore_web 5.0.3
• It does not work using using git (master or issue/13019)
• It works on Android
• It works when using cloud_firestore: 4.17.4

In my testing I'm listening to 2 documents in 2 locations. It seems subscribing a second time is cancelling the first one (i.e. no more data received on the first subscriber).