adding authenticated user to firestore 'users' collection flutter - flutter

Question

I am stuck at the adding an authenticated user to a firestore 'users' collection.
Unhandled Exception: [cloud_firestore/not-found] Some requested document
was not found.
User signs in via Google:
class GoogleSignInProvider extends ChangeNotifier {
final GoogleSignIn _googleSignIn = GoogleSignIn();
GoogleSignInAccount _user;
GoogleSignInAccount get user => _user;
AuthService auth = AuthService();
Future googleSignIn(BuildContext context) async {
try {
final googleUser = await _googleSignIn.signIn();
if (googleUser == null) return;
_user = googleUser;
final googleAuth = await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.credential(
idToken: googleAuth.idToken, accessToken: googleAuth.accessToken);
await FirebaseAuth.instance.signInWithCredential(credential);
} catch (e) {
print(e.toString());
}
final User currentUser = FirebaseAuth.instance.currentUser;
if (currentUser != null)
usersRef.add(currentUser.uid);
Navigator.of(context).pushReplacement(
CupertinoPageRoute(builder: (_) => TabScreen()));
notifyListeners();
}
However, no matter what and how I tried the authentication firebase id is not added to the usersRef (the firestore collection). How do I fix it?
My firestore rules are:
match /users/{userId}/{documents=**} {
allow read: if request.auth.uid != null;
allow write, update, create, delete: if isOwner(userId);
}
function isOwner(userId) {
return request.auth.uid == userId;
}
Help appreciated very much!

Answer 1

so this solved my issue:
final User currentUser = FirebaseAuth.instance.currentUser;
if (currentUser != null)
await usersRef.doc(currentUser.uid).set({'email':
user.email, 'username': user.displayName, 'photoUrl':
user.photoURL});
I think, I was overthinking it..
Thanks, ppl for the directions and help!

Answer 2

Do this.
Map data = {};
FirebaseFirestore.instance
.collection('usersCollection')
.doc(currentUser.uid)
.set(data);
in place of
usersRef.add(currentUser.uid);
Use set when you have doc id and use add when you want an auto generated id.