Trying to get single field from document: Stream builder is skipped-CodePudding

I am trying to log a user in with the boolean value assigned to the 'isVerified' field in the users firestore document. Logic: If 'isVerified' is true then continue, else return to verify page.

I put in debugPrint statements to help me catch the error and it appears that the StreamBuilder for the document reference is being skipped over without displaying an error.
I copy pasted the collection reference from another file and changed it to be a document reference, I think I messed up some of the code. I have read other documentation to regarding stream builders but I can't find where I'm going wrong, please let me know if there's anything I can clarify. Thank you

My Code:

class Home extends StatefulWidget {
  const Home({Key? key}) : super(key: key);

  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  late int currentScreen;

  // THESE SCREENS ARE FOUND IN THE NET FOLDER
  List<Widget> screens = <Widget>[
    const Login(),
    const Verify(),
    const Reset(),
    const UserPage(),
  ];

  @override
  Widget build(BuildContext context) {
    User? user = auth.currentUser;
    currentScreen = 0;
    // A: CHECK LOGIN STATUS OF USER AND DECIDE WHICH SCREEN TO SHOW USER
    // ignore: unnecessary_null_comparison
    if (user == null) {
      debugPrint('>> Home: No user recognized');
      // A: USER IS NOT LOGGED IN, SHOW THE SIGN IN SCREEN
      currentScreen = 0;
    } else {
      debugPrint('>> Home: User recognized');
      // A: Check user data for verification
      final DocumentReference<Map<String, dynamic>> userReference =
          FirebaseFirestore.instance.collection('users').doc(user.uid);

      // A: Use this streambuilder to check if the users account has been veriified or not
      // A: Check users document for 'isVerified'
      debugPrint('>> Home: Before Stream Builder');

      // THIS IS THE PART THAT SEEMINGLY GETS SKIPPED <----------------------------------------

      StreamBuilder(
        stream: userReference.snapshots(),
        builder: (BuildContext context, AsyncSnapshot<dynamic> userSnapshot) {
          if (!userSnapshot.hasData) {
            currentScreen = 0;
            debugPrint('>> test3');
            return const Text('No data');
          }
          if (userSnapshot.hasError) {
            currentScreen = 0;
            debugPrint('>> test4');
            return const Text('Snapshot error.');
          }
          final userData = userSnapshot.requireData;
          return ListView.builder(
              // itemCount: userData.size,
              itemBuilder: (context, index) {
                // ignore: unused_local_variable
                bool isVerified = userData[index]['isVerified'];
                // Send user to homepage
                if (isVerified == true) {
                  currentScreen = 3;
                }
                // Send user to verify page
                if (isVerified != true) {
                  currentScreen = 1;
                }
                // A: Show error and redisplay the sign in page
                else {
                  currentScreen = 0;
                }
                return const Text('');
                // return Scaffold(
                //   // BODY OF CONTENT
                //   body: Center(
                //     child: screens.elementAt(currentScreen),
                //   ),
                // );
              });
          // ToDo: A: Maybe return the current screen scaffold here, see if it that's needed or not
          // return const Text('');
        },
      );
    }
    // currentScreen = 0;
    return Scaffold(
      // BODY OF CONTENT
      body: Center(
        child: screens.elementAt(currentScreen),
      ),
    );
  }
}

CodePudding user response：

FirebaseFirestore.instance.collection('users').doc(user.uid).where('your filed', isEqualTo: 1).get();