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April 14, 2021 15:29
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Firebase: Get the parent of a snapshot.
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function getParent(snapshot) { | |
// You can get the reference (A Firebase object) from a snapshot | |
// using .ref(). | |
var ref = snapshot.ref(); | |
// Now simply find the parent and return the name. | |
return ref.parent().name(); | |
} | |
var testRef = new Firebase("https://example.firebaseIO-demo.com/foo/bar"); | |
testRef.once("value", function(snapshot) { | |
// Should alert "Name of the parent: foo". | |
alert("Name of the parent: " + getParent(snapshot)); | |
}); |
Hi everyone i have a big problem about my function it has an error and this it says: Error: function crashed. Details: Registration token(s) provided to sendToDevice() must be a non-empty string or a non-empty array.
And this is my code:
`const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.sendNewEmergencyNotification = functions.database.ref('messages/{id}').onCreate(event=>{
console.log('User to send notification');
var ref = admin.database().ref(`users/allusers/${pushId}/token`);
return ref.once("value", function(snapshot){
const payload = {
notification: {
title: 'An Emergency has been Reported!!',
body: 'Tap here to view details..'
}
};
admin.messaging().sendToDevice(snapshot.val(), payload)
}, function (errorObject) {
console.log("The read failed: " + errorObject.code);
});
})`
thank you in advance
how to retrieve parent using a collection of children firestore web app
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You can get all the snapshot keys by
Object.keys(snapshot.val());