android - 如何在 flutter 的 firestore 中使用 uid 更新用户数据

Question

我正在做一个项目，我在 Fire store 中存储了用户数据，包括名称、电子邮件和用户角色，这是这个的屏幕截图，用户角色被定义为基本。 check it out

现在我的身份验证服务代码在 flutter 中

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:http/http.dart';

class GSignInhelp {
 static FirebaseAuth _auth = FirebaseAuth.instance;

static signInWithGoogle() async {
GoogleSignIn googleSignIn = GoogleSignIn();
final account = await googleSignIn.signIn();
final auth = await account.authentication;
final credential = GoogleAuthProvider.credential(
  accessToken: auth.accessToken,
  idToken: auth.idToken,
);
final res = await _auth.signInWithCredential(credential);
return res.user;
}

static logOut(){
GoogleSignIn().signOut();
return _auth.signOut();
}

}

String role = 'basic';

class Usertype {
static FirebaseFirestore _db = FirebaseFirestore.instance;

static saveUser(User user) async {
 Map<String,dynamic> userData = {
  'name': user.displayName,
  'email': user.email,
  'role' : role,
 };

final userRef = _db.collection('users').doc(user.uid);
if((await userRef.get()).exists){
  get('role');
  userData.update('role', (value) => role);
}else{
  await userRef.set(userData);
}

}
}

我想在用户在这里成功付款时更新用户角色我正在使用 Razor pay 并且它的代码在这里

@override
void initState() {
super.initState();
_razorpay =Razorpay();
_razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, _handlePaymentSuccess);
_razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, _handlePaymentError);
_razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, _handleExternalWallet);
}

@override
void dispose() {
// TODO: implement dispose
super.dispose();
_razorpay.clear();
 }

 void openCheckout() async{
   var option= {
     "key": "rzp_test_rkbMfLcwVZtwyk",
     'amount': _paymentamount*100,
    'name': 'ghori fashion designer',
    'description': 'expert bane',
    'prefill' : {
    'contact' : '1234567890',
    'email' : 'anything@gmail.com',
   },
    'external' : {
    'wallet' : ['paytm']
  }
  };
  try{
  _razorpay.open(option);
  }
  catch(e){
  debugPrint(e);
  }
  }

 void _handlePaymentSuccess(PaymentSuccessResponse response){
 Fluttertoast.showToast(msg: "SUCCESS: "+ response.paymentId);
 setState(() {
  role = 'fullexpert';
 });
 }

 void _handlePaymentError(PaymentFailureResponse response){
 Fluttertoast.showToast(msg: "Error: "+ response.code.toString() + ' - ' + response.message);
 }

void _handleExternalWallet(ExternalWalletResponse response){
Fluttertoast.showToast(msg: "External Wallet: "+ response.walletName);
}

这是主要 Activity 代码

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:gfd_official/Login_data/Login.dart';
import 'package:gfd_official/Login_data/gSignin_data.dart';
import 'package:gfd_official/Mainhome.dart';
import 'package:gfd_official/paid_screens/Expert1year.dart';

void main() async {
 WidgetsFlutterBinding.ensureInitialized();
 await Firebase.initializeApp();
 runApp(MyApp());
 }

class MyApp extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
  return MaterialApp(
  title: 'ghori fashion designer',
  theme: ThemeData(
    primarySwatch: Colors.blue,
  ),
  home: MySplashScreen(),
 );
}
}

class MySplashScreen extends StatefulWidget {
 @override
_MySplashScreenState createState() => _MySplashScreenState();
}

// ignore: camel_case_types
class _MySplashScreenState extends State<MySplashScreen> {
@override
void initState() {
// TODO: implement initState
super.initState();
Future.delayed(
    Duration(
      seconds: 3,
    ),
        () {});
 }

 @override
 Widget build(BuildContext context) {
 return StreamBuilder(
  stream: FirebaseAuth.instance.authStateChanges(),
  builder: (context, snapshot) {
    if (snapshot.hasData && snapshot.data != null) {
      Usertype.saveUser(snapshot.data);
      return StreamBuilder(
          stream: FirebaseFirestore.instance.collection('users').doc(
              snapshot.data.uid).snapshots(),
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            if (snapshot.hasData && snapshot.data != null) {
              final user = snapshot.data.data();
              if(user['role'] == 'fullexpert'){
                return Expert1year();
              }else{
                return Mainhome();
              }
            }
            return Material(
              child: Center(child: CircularProgressIndicator(),),);
          });
    }
    return Loginpage();
  },
);
}
}

当我运行应用程序并在成功付款后进行付款时，没有任何反应，当我注销并再次登录时，Firestore 中的角色发生了变化，但是当我使用帐户付款并注销时，我发现有些奇怪，我只是刚登录的用户使用不同的帐户角色登录已更改，但已付款的用户未更改。

我得到的另一个问题是，下次用户再次登录角色时，角色仅更改一次，变为 basic 而不是 fullexpert

我用谷歌搜索了它，但由于 2020 年 firebase 和 flutter 发生了巨大变化，所有方法都不适用。

如果有人可以帮助我如何使用用户唯一 ID 或 UID 更改用户角色 并且此更改将一直保留到用户升级角色或降级角色并且应该针对特定用户.

Answer 1

当 _handlePaymentSuccess 被调用时，它会更新状态值 role，但是 role 没有在您的用户文档 streambuilder 中引用，试试这个:

未经测试

SuccessHandler(更新):

 void _handlePaymentSuccess(PaymentSuccessResponse response){
     Fluttertoast.showToast(msg: "SUCCESS: "+ response.paymentId);
     //Update the User role directly from here. When this is called the streambuilder will 
     //refesh. 
     userRef.update({'role': 'fullexpert'}).then((value) => print('Done!'));
     //setState(() {
      //role = 'fullexpert';
     //});
     }






 //String role = 'basic';
 DocumentReference userRef;

 class Usertype {
 static FirebaseFirestore _db = FirebaseFirestore.instance;
 
 static saveUser(User user) async {
  Map<String,dynamic> userData = {
   'name': user.displayName,
   'email': user.email,
   'role' : role,
  };

 userRef = _db.collection('users').doc(user.uid);
  if((await userRef.get()).exists){
   //Try removing this as it redundant: 
   //get('role');//???
   //userData.update('role', (value) => role);
  }else{
   await userRef.set(userData);
  }
 }
}