Firebase React Hook 錯誤：無法讀取未定義的屬性（讀取 '_repo'）

Question

我正在編寫一個鉤子來從下一個 js 中的即時資料庫取得 userole，我收到錯誤「無法讀取未定義的屬性（讀取'_repo'）」。這是我的鉤子的樣子

import { useEffect, useState } from "react";
import { useRouter } 從 "next/router";
import { onAuthStateChanged } from "firebase/auth";
import { auth, db } from "../firebase";

const useAuth = () => {
  const [currentUser, setCurrentUser] = useState(null);
  const [role, setRole] = useState(null);
  const router = useRouter();

  useEffect(() => {
    const unsubscribe = onAuthStateChanged(auth, (user) => {
      if (user) {
        setCurrentUser(user);
        state
      

        
        let nodeRef;
        if (user.role === "user") {
          nodeRef = ref(db, `users/${user.uid}/role`);
        } else if (user.role === "trainer") {
          nodeRef = ref(db, `trainers/${user.uid}/role`);
        } else if (user.role === "admin") {
          nodeRef = ref(db, `admins/${user.uid}/role`);
        } else if (user.role === "nutritionist") {
          nodeRef = ref(db, `nutritionists/${user.uid}/role`);
        }

        onValue(nodeRef, (snapshot) => {
          const userRole = snapshot.val();
          setRole(userRole);
        });
      } else {
        setCurrentUser(null);
        setRole(null);
        // Redirect to login page if user is not logged in
        router.push("/login");
      }
    });

    
    return () => unsubscribe();
  }, []);

  return { currentUser, role };
};

export default useAuth;

這就是我的 firebase 設定的樣子

// Import the functions you need from the SDKs you need
import { initializeApp } from "firebase/app";
import { getAuth } from "firebase/auth";
import { getDatabase } from "firebase/database";
import { getStorage } from "firebase/storage";

const firebaseConfig = {
  
};

// Initialize Firebase
const app = initializeApp(firebaseConfig);
const auth = getAuth(app);
const db = getDatabase(app);
const storage = getStorage(app);

export { auth, db, storage };

這是我的資料庫結構

- users
  - <user_id>
    - displayName: "User's display name"
    - email: "User's email address"
    - role: "user"
    - ...
- trainers
  - <trainer_id>
    - displayName: "Trainer's display name"
    - email: "Trainer's email address"
    - role: "trainer"
    - ...
- admins
  - <admin_id>
    - displayName: "Admin's display name"
    - email: "Admin's email address"
    - role: "admin"
    - ...
- nutritionists
  - <nutritionist_id>
    - displayName: "Nutritionist's display name"
    - email: "Nutritionist's email address"
    - role: "nutritionist"
    - ...

我一直在嘗試這個，因為很明顯我在資料庫上做錯了什麼，但我嘗試閱讀文件但仍然遇到問題。我是 firebase 的新手。

Answer 1

提供給 onAuthStateChanged()的回调> 透過 User 物件。它沒有 role 屬性。

這表示以下幾行沒有任何作用：

let nodeRef;
if (user.role === "user") {
  nodeRef = ref(db, `users/${user.uid}/role`);
} else if (user.role === "trainer") {
  nodeRef = ref(db, `trainers/${user.uid}/role`);
} else if (user.role === "admin") {
  nodeRef = ref(db, `admins/${user.uid}/role`);
} else if (user.role === "nutritionist") {
  nodeRef = ref(db, `nutritionists/${user.uid}/role`);
}

執行上面的程式碼後，nodeRef 將變為undefined，然後您將其輸入到onValue 中，它會引發您看到的錯誤。 p>

如果使用者的角色已作為自訂新增至使用者的驗證令牌中宣告，您需要取得使用者的 ID 令牌，然後取得所需的宣告。

user.getIdTokenResult()
  .then(idToken => {
    const tokenRole = idToken.claims.role;
    // trust it?
    setRole(tokenRole);
  })
  .catch(err => {
    // TODO: Handle token handling errors
  });