问颤振-如何在使用GetX重定向之前检查用户角色

EN

   void onReady() {
    super.onReady();
    firebaseUser = Rx<User?>(auth.currentUser);
    firebaseUser.bindStream(auth.userChanges());

    //GetX function that listens to user state changes
    ever(firebaseUser, _setInitialScreen);
  }

    //gets called immediately after sign up, giving no chance to check user role
   _setInitialScreen(User? user) async {
    if (user == null) {
      Get.offAll(() => AuthenticationScreen());
    } 

      //Need to check user role here (before going to else)
      else {
          if (userModel.value.role == "fieldOwner") {
            Get.offAll(() => FieldOwnerHome(user: user));
          } else {
            Get.offAll(() => HomeScreen(user: user));
          }
    }
  }

  void signUp() async {
    showLoading();
    try {
      await auth
          .createUserWithEmailAndPassword(
              email: email.text.trim(), password: password.text.trim())
          .then((result) async {
        String? _userId = result.user?.uid;
        await _addUserToFirestore(_userId);

       //function to get user and check role
        await _initializeUserModel(_userId);

        _clearControllers();
      });
    } catch (e) {
      debugPrint(e.toString());
      Get.snackbar(
        "Sign Up Failed",
        e.toString(),
        snackPosition: SnackPosition.BOTTOM,
      );
      dismissLoading();
    }
  }