How to trigger Cloud Functions from Google cloud firestore

Question

How to send the DocumentReference.getId() that is generated every time a new document was added to firestore from Android Studio to cloud function that triggers when there is a write/create operation on Firestore. I tried following

'use strict'; const https = require( 'firebase-functions'); const functions = require('firebase-functions'); const Firestore = require('@google-cloud/firestore'); const firestore = new Firestore(); const admin = require('firebase-admin'); admin.initializeApp(functions.config().firebase); exports.helloUser = functions.firestore .document('BankInform/Moj2HBrxepX5R7FonvrO') .onUpdate(event =>{ var newValue = event.data.data(); return event.data.ref.update({ "status": "Success" }); });

But I have to give the autoid of document.How to pass document id from android studio to cloud functions

Did you try anything yet? If not, I recommend starting with the documentation on Firestore triggers for Cloud Functions. If you got/get stuck, share the minimal code that reproduces where you're stuck. — Frank van Puffelen
– Frank van Puffelen, Commented Oct 16, 2017 at 14:41

Mike McDonald · Accepted Answer · 2017-10-16 16:39:23Z

You want to use wildcards in your function:

exports.helloUser = functions.firestore .document('BankInform/{transactionId}') .onUpdate(event =>{ var transactionId = event.params.transactionId console.log(transactionId); // Moj2HBrxepX5R7FonvrO });

As you can see, you should be able to use event.params to get the appropriate document name from the function.

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