Issue with Flutter retrieving data from Firestore (Authenticating different users types from collection) - flutter

Question

I am having an issue with trying to route different users to different views in flutter.
I will attach my code below. I have authentication working and routing to the main view. I am now trying to query a Users table in my database (screenshot attached). I want to check by email that the user isStudent and route to menu page. if not a student then route to a separate page.
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_tex/flutter_tex.dart';
import 'package:maths_for_computing/components/roundedButton.dart';
import 'package:maths_for_computing/screens/chat_screen.dart';
import 'package:flutter/material.dart';
import 'package:maths_for_computing/components/roundedButton.dart';
import 'package:maths_for_computing/constants.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:maths_for_computing/screens/latex_example.dart';
import 'package:modal_progress_hud_nsn/modal_progress_hud_nsn.dart';
import 'chat_screen.dart';
import 'menu_student.dart';
final GlobalKey<ScaffoldState> _key = GlobalKey(); // Create a key
final _firestore = FirebaseFirestore.instance;
class LoginScreen extends StatefulWidget {
static const String id = 'login_screen';
#override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
bool showSpinner = false;
final _auth = FirebaseAuth.instance;
late String email;
late String password;
Future getUsers(String email) async {
final users = await _firestore
.collection('Users')
.where('email', isEqualTo: email)
.get();
for (var user in users.docs) {
print(user.get("email"));
//return user.get("isStudent") as String;
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: ModalProgressHUD(
inAsyncCall: showSpinner,
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 24.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Flexible(
child: Hero(
tag: 'logo',
child: Container(
height: 200.0,
child: Image.asset('images/logo.png'),
),
),
),
const SizedBox(
height: 48.0,
),
TextField(
keyboardType: TextInputType.emailAddress,
textAlign: TextAlign.center,
onChanged: (value) {
//Do something with the user input.
email = value;
},
decoration:
kTextFieldDecoration.copyWith(hintText: 'Enter your email'),
),
const SizedBox(
height: 8.0,
),
TextField(
obscureText: true,
textAlign: TextAlign.center,
onChanged: (value) {
//Do something with the user input.
password = value;
},
decoration: kTextFieldDecoration.copyWith(
hintText: 'Enter your password'),
),
const SizedBox(
height: 24.0,
),
RoundedButton(
title: 'Log In',
colour: Colors.lightBlueAccent,
onPressed: () async {
setState(() {
showSpinner = true;
});
try {
final user = await _auth.signInWithEmailAndPassword(
email: email, password: password);
String userType = getUsers(email) ;
// getUsers(email);
if (user != null) {
if (isStudent == 'N') {
Navigator.pushNamed(context, ChatScreen.id);
} else {
Navigator.pushNamed(context, MenuScreen.id);
}
}
} catch (e) {
print(e);
}
setState(() {
showSpinner = false;
});
},
),
],
),
),
),
);
}
}
Any help or advice on this or best practice would be much appreciated. This is a small app so trying to stay away from Custom claims as I am very new to flutter and don't want to overcomplicate things.
Many thanks
E

Answer 1

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_tex/flutter_tex.dart';
import 'package:maths_for_computing/components/roundedButton.dart';
import 'package:maths_for_computing/screens/chat_screen.dart';
import 'package:flutter/material.dart';
import 'package:maths_for_computing/components/roundedButton.dart';
import 'package:maths_for_computing/constants.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:maths_for_computing/screens/latex_example.dart';
import 'package:modal_progress_hud_nsn/modal_progress_hud_nsn.dart';
import 'chat_screen.dart';
import 'menu_student.dart';
final GlobalKey<ScaffoldState> _key = GlobalKey(); // Create a key
final _firestore = FirebaseFirestore.instance;
class LoginScreen extends StatefulWidget {
static const String id = 'login_screen';
#override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
bool showSpinner = false;
final _auth = FirebaseAuth.instance;
late String email;
late String password;
Future getUsers(String email) async {
final users = await _firestore
.collection('Users')
.where('email', isEqualTo: email)
.get();
for (var user in users.docs) {
print(user.get("email"));
//return user.get("isStudent") as String;
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: ModalProgressHUD(
inAsyncCall: showSpinner,
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 24.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Flexible(
child: Hero(
tag: 'logo',
child: Container(
height: 200.0,
child: Image.asset('images/logo.png'),
),
),
),
const SizedBox(
height: 48.0,
),
TextField(
keyboardType: TextInputType.emailAddress,
textAlign: TextAlign.center,
onChanged: (value) {
//Do something with the user input.
email = value;
},
decoration:
kTextFieldDecoration.copyWith(hintText: 'Enter your email'),
),
const SizedBox(
height: 8.0,
),
TextField(
obscureText: true,
textAlign: TextAlign.center,
onChanged: (value) {
//Do something with the user input.
password = value;
},
decoration: kTextFieldDecoration.copyWith(
hintText: 'Enter your password'),
),
const SizedBox(
height: 24.0,
),
RoundedButton(
title: 'Log In',
colour: Colors.lightBlueAccent,
onPressed: () async {
setState(() {
showSpinner = true;
});
try {
final _auth = FirebaseAuth.instance;
await _auth.signInWithEmailAndPassword(email: email, password: password).then((uid) => {
FirebaseFirestore.instance.collection("users").doc(uid.user.uid).get().then((value) {
Map<dynamic, dynamic> currentUser = value.data();
if(currentUser['isStudent']=="N") {
Navigator.pushNamed(context, ChatScreen.id);
}
else {
Navigator.pushNamed(context, MenuScreen.id);
}
}),
});
} catch (e) {
print(e);
}
setState(() {
showSpinner = false;
});
},
),
],
),
),
),
);
}
}