CODEWITHSUNDEEP
node.jsfirebasefirebase-realtime-databasegoogle-cloud-functions
GKH
GKH

Reputation: 179

Cloud Functions for Firebase child_added

I'm trying out Cloud Functions for Firebase, creating a function which will add a nickname when a new user is added to the database (not on auth). From the Firebase Documention I've found that I need to use:

ref.on("child_added", function(snapshot, prevChildKey) { 
    //Something
})

, but I cannot even get the function to deploy. My code is:

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

var ref = admin.database().ref("/users");

ref.on("child_added", function(snapshot, prevChildKey) {
  console.log(snapshot)
})

Can someone help me?

Update:

After working on it this is now my code:

const functions = require('firebase-functions');
// Import Admin SDK
var admin = require("firebase-admin");
admin.initializeApp(functions.config().firebase);

var db = admin.database();
var ref = db.ref('users');
var childs = [];
var nicknames = [];

exports.newUser = functions.database.ref('users').onWrite(event => {
    const data = event.data.val();
    ref.on("child_added", function(snapshot, childKey) {
        if (!childs.includes(childKey)) {
            childs.push(childKey);
        };
        for (i in childs) {
            if (childs[i] == null) {
                childs.splice(i, 1);
            };
        };
    });

    ref.once("value", function(snapshot) {
        for (i in childs) {
            var child = data[childs[i]];
            if (!child.hasOwnProperty("nickname")) {
                console.log("Child does not have nickname: " + childs[i]);
                ref.child(childs[i]).update({
                    nickname: "user"+childs[i]
                });
            };
        };
    });
});

Based on what Doug Stevenson has replied, I still need to figure out how to only do this if there's actually a new child being added (new user)

Upvotes: 3

Views: 2850

Answers (1)

GKH
GKH

Reputation: 179

I figured it out. Here's the code I used:

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

var childs = [];
var nicknames = [];

exports.newUser = functions.database.ref('users').onWrite(event => {
    ref.on("child_added", function(snapshot, childKey) {
        if (!childs.includes(childKey)) {
            childs.push(childKey);
        }
    });
});

I would like it only to be called when a child is added and not every time something is written to the database (to limit usage)

Upvotes: 1

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