Is there any ways to pass parameters in riverpod's provider

user_10476111 0
Viewed 4332

How do I pass a FirebaseAuth user to a StreamProvider in riverpod?

When using old provider package, I used to get the user.uid from FirebaseAuth and pass the variable to the StreamProvider, returning the StreamProvider if we could get the user.uid.

@override
  Widget build(BuildContext context) {
    final FirebaseAuthService authService =
        Provider.of<FirebaseAuthService>(context, listen: false);
    return StreamBuilder<User>(
      stream: authService.onAuthStateChanged,
      builder: (BuildContext context, AsyncSnapshot<User> snapshot) {
        final User loggedInUser = snapshot.data;
        if (loggedInUser != null) {
          final String userId = loggedInUser.userId;
          return MultiProvider(
            providers: <SingleChildWidget>[
              StreamProvider<User>(
                initialData: User.initialData(),
                create: (_) => DB.instance.getLoggedInUserStream(
                  loggedInUserId: userId,
                ),
riverpod flutter provider
2 Answers

You can use the family feature of Riverpod.

final user = StreamProvider.family<User, String>((ref, uid) {
  // use uid to get User
  return User;
});

Then use the provider:

useProvider(user(uid));

Alternatively, you could read the value from the user provider directly from your FirebaseAuthService provider.

final user = StreamProvider<User>((ref) {
  final stream = ref.watch(FirebaseAuthService.stream);
  // get uid from stream data
  return User;
});
user_72598580

Use family modifier for passing external values to provider.

final userStreamProvider = StreamProvider.family<User, String>((ref, uid) {
  return User(id: uid);
});

When using provider, we need to pass the value to userStreamProvider

For flutter_riverpod users,

Widget build(BuildContext context, ScopedReader watch) {
  final user = watch(userStreamProvider(uid));
}

For hooks_riverpod users,

Widget build(BuildContext) {
  final user = useProvider(userStreamProvider(uid));
}
user_46083340
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