Flutter Question posted in
The official Flutter documentation can be found here.

Flutter – Firebase/Futter user.displayName field stored as null when storing on cloud-firestore

I am building an app using Flutter and Firebase. I am trying to create a user profile on their first login to the app. I am using the Google sign-in method provided by Firebase authentication.

This is my code for the same:

void _handleGoogleSignIn() async {
    try {
      GoogleAuthProvider googleAuthProvider = GoogleAuthProvider();
      UserCredential userCredential =
          await _auth.signInWithProvider(googleAuthProvider);
      User? user = userCredential.user;

      // check if user pf exists
      if (user != null) {
        DocumentSnapshot userDoc = await FirebaseFirestore.instance
            .collection("users")
            .doc(user.uid)
            .get();

        // if not there, then create
        if (!userDoc.exists) {
          await FirebaseFirestore.instance
              .collection("users")
              .doc(user.uid)
              .set(
            {
              "photoUrl": user.photoURL,
              "displayName": user.displayName,
              "email": user.email,
            },
          );
        }
      }
    } catch (e) {
      showDialog(
        context: context,
        builder: (context) {
          return AlertDialog(
            content: Text(e.toString()),
          );
        },
      );
    }
  }

I am storing displayName, photoUrl, email, and other fields (still thinking). But on the Firestore window, it shows that the document was stored with displayName set to null.

null field

So what am I doing wrong, and what is the fix?

Tags:

2

Answers


  1. 0

    The Display Name will be null when you create the user, You need to update it adter creating the user

    _auth.currentUser.updateDisplayName('Insert the name here');
    Login or Signup to reply.
  2. 0

    Since you’re using Firebase Authentication with Google, most likely you should read the username field that exists inside the AdditionalUserInfo class. So in code, it should be something like this:

    UserCredential userCredential = await _auth.signInWithProvider(googleAuthProvider);
String username = userCredential.additionalUserInfo.username;
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search