Firebase Cookbook

How to do it...

Let's suppose we have a form, and this form will give people the opportunity to register for the date of an upcoming book release. For this, what we will need to do is quite simple:

1. We will listen to any new writing operation that is being made over our form DB route and extract the data accordingly using the following code:

      exports.sendEmailWhenSubscribe =                      functions.database.ref('/bookevent').onWrite(ev =>                          {        //getting the event data.        const userMeta = ev.data;        const email = userMeta.email;        const displayName = user.displayName;        switch(ev.eventType) {           case           "providers/firebase.auth/eventTypes/user.create" :            //TODO Send confirmation email from here          break;          case         "providers/firebase.auth/eventTypes/user.delete" : //TODO ...