Firebase: Trigger event in Firestore on new user created in FirebaseAuth

Question

I wrote a very simple Cloud Function to add some fields in Firestore with some info from the newly created FirebaseUser in FirebaseAuth.

In Firestore, I have a collection named "highscore". Everytime, a new user is created, I want to add a document with the firebaseusers uid as document, and 2 fields, like:

highscore/uid/score & highscore/uid/usernick (eg highscore/fgt38gudg9/430 & highscore/fgt38gudg9/cooldude45)

This is my function:

const functions = require('firebase-functions');

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

const db = admin.database()

//On user creation, trigger: Add information to /highscore/uid
exports.onUserCreation = functions.auth.user().onCreate((user) => {

    const collection = db.collection("highscore")
    const userid = user.uid
    const usernick = user.displayName
    collection.doc(userid).set({
        score: 0
        user: usernick
    })

})

However, when the function is triggered, I run into this error:

TypeError: db.collection is not a function
    at exports.onUserCreation.functions.auth.user.onCreate (/srv/index.js:11:24)
    at cloudFunctionNewSignature (/srv/node_modules/firebase-functions/lib/cloud-functions.js:120:23)
    at /worker/worker.js:825:24
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:229:7)

I can't figure this out. Any suggestions?

Answer 1

我认为您正在使用Firstore：

const db = admin.firestore()

Answer 2

admin.database() gets you a reference to the Realtime Database instance for your project. What you want to use instead is admin.firestore() .

Also, you will want to return the promise that you get from set() , otherwise, the operation might not complete before the function terminates.

return collection.doc(userid).set({
    score: 0
    user: usernick
})

Be sure to read the documentation about terminating functions to understand your obligations in dealing with async work represented by promises.