authentication state changes return always null

Question

I am trying to create a stream of my user modal based on the authenticate services of fire base.

create user object base on FirebaseUser:

 UnicoUser? _userFromFirebaseUser(User? user){ if (user != null) { UnicoUser? _unicoUser; DatabaseService(uid: user.uid).getUserFromUserId().then((value){ _unicoUser = value; print("user id: "+ value.uid);}); return _unicoUser; } return null; }

create the auth change user stream:

 Stream<UnicoUser?> get unicoUser { return _auth.authStateChanges().map(_userFromFirebaseUser); }

the implement in the widget:

StreamBuilder( stream: AuthServices().unicoUser, builder: (context, AsyncSnapshot<UnicoUser?> snapshot) { if (snapshot.connectionState == ConnectionState.waiting){ return const Loading();} else if(snapshot.hasData ){ return LoggedInWrapper(currentUser: snapshot.data!,);} else if (snapshot.hasError){ return const Center(child: Text("Something went wrong"),);} else { print("snapshot is: "+ snapshot.data.toString());return const Authenticate();} }, )

even if the user is authenticated and the unicouser object is not null the snapshot data is null.. output:

Performing hot reload... Syncing files to device AOSP on IA Emulator... Reloaded 0 libraries in 111ms. I/flutter (22920): snapshot is: null I/flutter (22920): user id: fnWyLWrCznQDSmZGr6kShpXSsK52

Stefan Galler · Accepted Answer · 2021-11-26 12:17:51Z

The problem is your _userFromFirebaseUser function. Unfortunately, you cannot handle async values this way. The function returns before your _unicouser is set by then. You need to use an async function and await the result like this:

Future<UnicoUser?> _userFromFirebaseUser(User? user) async { if (user != null) { return await DatabaseService(uid: user.uid).getUserFromUserId(); } return null; }

Then you should be able to use it like this:

Stream<UnicoUser?> get unicoUser { return _auth.authStateChanges().asyncMap(_userFromFirebaseUser); }

Collectives™ on Stack Overflow

authentication state changes return always null

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related