如何为特定用户写入firebase？

Question

我是 firebase 的超级新手，我正在查看 https://firebase.google.com/docs/auth 我能够使用firebase注册并登录，我将用户信息添加到身份验证->用户中。然后在您登录后重定向到一个表单。该表单当前将我想要的数据添加到实时数据库中（我在注册和登录之前让它工作）但我的问题是数据没有附加/在它登录的帐户下.所以现在只是一堆随机数据，不知道是谁的数据。我环顾四周，找不到任何有关如何使两者连接的信息。下面我包括了我的登录功能和更新数据库的功能。感谢您的帮助！

function loggingIn() {
  var notyf = new Notyf();
  console.log("Logging In");
  var email = document.getElementById("emailVal").value;
  var password = document.getElementById("passVal").value;
  console.log("Email: ", email, " Password: ", password);
  const promise = firebase.auth().signInWithEmailAndPassword(email, password);
  firebase.auth().onAuthStateChanged(function(user) {
    if (user) { // User is signed in.
      notyf.success('Logged in successfully');
      questionPage()
    } else {
      promise.catch(e => alert(e.message));
    }
  });
}

function setup(){
  //initialization and firebaseConfig is here as well
   dataMessage = firebase.database().ref('PersonData');
}
function writeUserData(activity, hours) {
  let newdataMessage = dataMessage.push();
  newdataMessage.set({
   funactivity: activity,
   sleep: hours
 });
}

我找到的解决方案如下：

function writeUserData(activity, hours) {
  var userId = firebase.auth().currentUser.uid;
  dataMessage = firebase.database().ref('PersonData/'+userId);
  let newdataMessage = dataMessage.push();
  newdataMessage.set({
   funactivity: activity,
   sleep: hours
   });
  }

使用 firebase.auth().currentUser.uid;让我将数据添加到当前用户。

Answer 1

您可以构建您的发布路线以获取动态数据，这是一个示例：

let postMessageRef = firebase.database().ref(`messages/${path}`);

在这种情况下，您可以动态地将路径更改为用户名/您的条件是什么

然后这是实际的帖子

postMessageRef
    .set({
        message: message,
        from: userName
    })
    .catch((err) => console.log(err))

编辑 下次我会读得更好...

  let userName = "placeholderToPreventDBWipes";

  const onAuthStateChanged = (user) => {
    userName = user;
  };


 ~~In this case I used useEffect, but you can throw this in your .then()~~
      useEffect(() => {
        const subscriber = auth().onAuthStateChanged(onAuthStateChanged);
        return subscriber; //unsub @ unmount
      }, []);