如何从 function 返回我的 Firebase 实时数据库的快照值？

Question

I want to return the snapshot.val() , of my Realtime Database:

function get_details(){
   get(ref(db,"pay/0/0/")).then((snapshot) => {
       if (snapshot.exists()) {
           var resp = [];
           resp.push(snapshot.val());
           return resp;
       }
   }
}

let response = get_details();
console.log(response); //undefined

I keep getting undefined as the returned value. I have followed the answer from this post.

How do I resolve this issue?

Answer 1

If you are calling get_details from somewhere else in the code. Try:

async function get_details() {
  const snapshot = await get(ref(db, "pay/0/0/"))
  return snapshot.val()
}

// get_details() also returns a Promise.
get_details().then((response) => {
  // continue
  console.log('Value is', response)
})


// Alternatively, if parent function is async

const mainFunc = async () => {
  const response = await get_details()
}

Also checkout How do I return the response from an asynchronous call?