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ViewsConverting JSON to Array with Cloud Functions
When I use this function I get the following result from my realtime database. It looks like a json object. How can I turn that to an array or retrieve the string userName? snapshot.userName is not working.
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.Push = functions.database.ref('/placeID/{pushId}/')
.onCreate((snapshot, context) => {
console.log(snapshot)
})
2 answers
Answer question0
A Realtime Database DataSnapshot object is a container that contains your data. To get the data it contains, you need to retrieve its value using the val() method:
console.log(snapshot.val());
To get the userName from your data, you can use either:
console.log(snapshot.val().userName)
// note: if "userName" is missing, this will log `undefined`
or
// more useful with large snapshots
console.log(snapshot.child("userName").val())
// note: if "userName" is missing, this will log `null`
See following link for more info about the DataSnapshot object and available methods/properties:
https://firebase.google.com/docs/reference/functions/providers_database.datasnapshot
Added note: The DataSnapshot class overrides the toJSON() method, this is why when you log it, you saw the data it contained rather than the DataSnapshot's own methods/properties.
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snapshot is a reference to a Firestore document. In order to get the data contained in a document doc you need to call doc.data(). So in your case it would be doc.data().userName.
See the documentation for some examples.