使用firebase云功能从firebase数据库中删除节点

Question

I'm trying to make a firebase cloud function to delete a node from Firebase Database. The log messages show that the function executed "ok" but it doesn't seem to remove any element from the database. I wrote the function taking help from the accepted answer in How to delete data in Firebase? Here is the snippet of the code

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

//path is defined as the value to be deleted,
console.log("Deleting element " + path);
var ref = admin.database().ref("/")
ref.orderByValue().equalTo(path).on('child_added', function(snapshot) {
    console.log("Snapshot.ref = " + snapshot.ref);
    snapshot.ref.remove();
    return;
});

Also, in the above code, "Deleting element path_value" does show up in the log but Snapshot.ref = ... doesn't show up.

I don't have enough credits to embed images yet so here is a link to my database Structure of Firebase Database

Answer 1

I think the selection is wrong. Double check that ref.orderByValue().equalTo(path) is actually equal to something.

ref.once('value')
  .then(function(dataSnapshot) {
    // handle read data.
  });

https://firebase.google.com/docs/reference/admin/node/admin.database.Reference

var adaRef = admin.database().ref('users/ada');
adaRef.remove()
  .then(function() {
    console.log("Remove succeeded.")
  })
  .catch(function(error) {
    console.log("Remove failed: " + error.message)
  });