Firebase Cookbook

How to do it...

Once you've successfully configured your project, let's start integrating the function within our online store.

1. We need to listen to our purchases  collections over our Database using the onWrite function to any new writing operation that was made over our collection, like the following  :

     exports.updateStats =         functions.database.ref('/purchases/{pushId}/item').onWrite(event            =>         {        const addedPurchases = event.data.val();       const status = `${addedPurchases.name.toUpperCase()} - is a        ${addedPurchases.type} - is PENDING`;       return event.data.ref.parent.child('status').set(status);     });

2. Now to upload your newly created function, simply head to your console and execute the following command:

 ~> firebase deploy --only functions ...