實時數據庫訂閱不工作：Firebase

Question

我有一個設置來監聽 firebase 數據庫中的實時變化：

這是路徑的樣子： Path = funfuse/users/connected-users/AfYXmJroEKQwnhiFXXXXXiyblti22

這就是我的數據庫的結構：

當我嘗試向最后一個子項（即connected-users ）添加條目時，它會在數據庫中更新，但即使我的應用程序在我的 web 瀏覽器上運行，我也沒有收到任何更新日志消息：

 useEffect(() => {
    if (isLoggedIn && firebaseToken !== '') {
      const path = `${rdb_paths.funfuse_connected_users}/${user?.uid ?? ''}`;
      const connectionsRef = ref(rdb, path);
      console.log('Path = ', path);

      onValue(connectionsRef, (snapshot) => {
        console.log('Values = ', snapshot.val());
      });
      return () => {
        console.log('Switching off listening');
        off(connectionsRef);
      };
    }
  }, [firebaseToken, isLoggedIn, user?.uid]);

我在這里做錯了什么嗎？ 為什么我無法獲取更新。 這是我的安全規則：

{
  "rules": {
    "funfuse": {
      "users": {
        "requests-users": {
          "$uid": {
            ".read":"$uid === auth.uid && auth.token.email_verified === true",
            ".write":"$uid === auth.uid && auth.token.email_verified === true"
          }
        },
        "requested-users": {
          "$uid": {
            ".read":"$uid === auth.uid && auth.token.email_verified === true",
            ".write":"$uid === auth.uid && auth.token.email_verified === true"
          }
        },
       "connected-users": {
        "$uid": {
          ".read":"$uid === auth.uid && auth.token.email_verified === true",
          ".write":"$uid === auth.uid && auth.token.email_verified === true"
        }
      } 
      }
    }
  }
}

我確實運行了一個模擬來讀取和寫入數據，它運行良好。 我是否需要添加額外的規則來監聽數據更新？

Answer 1

我意識到問題是因為它使用default數據庫 Url，因為我沒有在我的配置 object 中傳遞它：

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FB_CLIENT_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FB_CLIENT_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_FB_CLIENT_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FB_CLIENT_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_FB_CLIENT_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FB_CLIENT_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_FB_CLIENT_MEASUREMENT_ID,
};

將以上內容更改為：

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FB_CLIENT_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FB_CLIENT_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_FB_CLIENT_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FB_CLIENT_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_FB_CLIENT_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FB_CLIENT_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_FB_CLIENT_MEASUREMENT_ID,
  databaseURL: process.env.NEXT_PUBLIC_FB_CLIENT_DB_URL,
};

為我解決了這個問題。