Pavlo Glazkov pglazkov

Full stack dev, with a focus on UI. JavaScript/TypeScript, Angular, Node.js, .NET, DevOps

pglazkov / firestore-collection-count-cloud-function.js

Created March 25, 2018 18:32

Firestore cloud function that maintains a document field that contains number of items in a collection

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

	const db = admin.firestore();

	exports.updateMyCollectionCount = functions.firestore
	.document(`users/{userId}/my-collection/{itemId}`)
	.onWrite(event => {

	const isUpdate = event.data.exists && event.data.previous.exists;