Cloud Functions for Firebaseでは、次のようになります。
exports.makeUppercase = functions.database.ref('/messages/{pushId}/original')
.onWrite(event => {
//how to access data at another node, for example
//important/messages/{pushId}
})
別のノードでデータを読み取る方法(例:/important/messages/{pushId}
?ありがとう
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
})
})
たとえば、次の例を確認してください: https://github.com/firebase/functions-samples/blob/master/fcm-notifications/functions/index.js