Question

在React Firebase中，我正在尝试读取用户数据，并且快照给出的值为null

读取用户的代码是：



 constructor() {
    app.initializeApp(config);

    /* Helper */

    this.serverValue = app.database.ServerValue;
    this.emailAuthProvider = app.auth.EmailAuthProvider;

    /* Firebase APIs */

    this.auth = app.auth();
    this.db = app.database();



  }

 this.auth.onAuthStateChanged((authUser: any) => {
      if (authUser) {
        this.db.ref(`users/${authUser.uid}`)
          .once('value')
          .then(snapshot => {
            const dbUser = snapshot.val(); // RETURNING NULL ISSUE ISSUE

            // default empty roles
            if (!dbUser.roles) {
              dbUser.roles = {};
            }

            // merge auth and db user
            authUser = {
              uid: authUser.uid,
              email: authUser.email,
              emailVerified: authUser.emailVerified,
              providerData: authUser.providerData,
              ...dbUser,
            };
            this.authUser = authUser;
            next(authUser);
          }).catch((err) => {
            fallback();
          });
      } else {
        fallback();
      }
    });

我已经检查authUser.uid是有效的uid-ojaGkteKX7evSEakaSlA8CZNBMJ3

我的Firebase中同一用户的屏幕截图：

实时数据库规则：

 {
  "rules": {
    "users": {
      ".read":true,
      "$uid": {
        ".read": true,
        ".write": "$uid === auth.uid"
      }
    }
  }
}

云存储规则：

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {

    match /users/{userId}{
    allow read, delete;
  }

  }



}

Answer 1

我假设在firebase中创建用户时，会在firebase中自动创建一个用户节点

如果您希望上述情况发生，则可以使用云功能，并使用firebase身份验证触发器：

const admin = require('firebase-admin');
const functions = require('firebase-functions');
admin.initializeApp();

exports.newUser = functions.auth.user().onCreate((user) => {
 const root = admin.database().ref();
 ref.child("users").child(user.uid).set({
  email: user.email,
  displayName: user.displayName
  });
});

有关更多信息，您可以检查以下内容：

https://firebase.google.com/docs/functions/auth-events

https://firebase.google.com/docs/database/admin/save-data

https://firebase.google.com/docs/functions/get-started

firebase从javascrpipt读取用户/ {uid}

1 个答案: