Access db data in Cloud Functions for Firebase

Question

In Cloud Functions for Firebase, for example:

exports.makeUppercase = functions.database.ref('/messages/{pushId}/original')
    .onWrite(event => {
    //how to access data at another node, for example 
    //important/messages/{pushId}
})

How to do I read data at another node, for example /important/messages/{pushId}? Thanks

MartinT · Accepted Answer · 2021-05-10 20:14:57Z

20

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

exports.makeUppercase = functions.database.ref('/messages/{pushId}/original').onWrite(event => {
   const getSomethingPromise = admin.database().ref(`/important/messages/{pushId}`).once('value');
   return getSomethingPromise.then(results => {
            const somethingSnapshot = results[0];
            // Do something with the snapshot
        })
    })

Check this example for instance: https://github.com/firebase/functions-samples/blob/master/fcm-notifications/functions/index.js

edited May 10, 2021 at 20:14

MartinT

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answered Apr 27, 2017 at 7:03

Incinerator

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2 Comments

Famic Tech Over a year ago

How can you read the remaining data on the node /messages/{pushId}/original!? Example if you wanted to read the remaining data on the path /messages/{pushId}/

Incinerator Over a year ago

event.data.val() will give you the data in the /messages/{pushId}/original node

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