Firebase: Get the parent of a snapshot.

firebase_snapshot_parent.js

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));
});

hello

Hey

grt

line 6, need to be updated to :

return ref.parent().key();

so very helpful when using child_changed, and targeting nested children and wanting to know their parent ID for example.

And you can do this:
ref.parent().parent().key()

var ref = snapshot.ref(); is invalid? This throws a TypeError?!
'ref' is a property not a function, see: https://firebase.google.com/docs/reference/js/firebase.database.DataSnapshot#ref

how to fetech data in database using node js without using child in firebase

Thank you !

For Database Trigger Operation , to get the Immediate parent , i used
var parentKey = snapshot.data.ref.parent.key;

This worked -> snapshot.ref.parent.key

snapshot.ref.parent() is incorrect and throws a type error ('parent()' is not a function). snapshot.ref.patent works.

Use childSnapshot.ref.parent.getKey() to obtain the parent key.

Thumbs up for snapshot.ref.parent.key

Thanks a lot for snapshot.ref.parent.key

hai

how to fix this issue ,i am also follow above code
firebase: snapshot.getKey is not a function jquery

But my shapshot file this

`function getParent(snapshot) {
// You can get the reference (A Firebase object) from a snapshot
// using .ref().
var ref = snapshot.ref();
var key = Object.keys(snapshot.val())[4];

// Now simply find the parent and return the name.
return key;
}

var firebaseRef_ch = new Firebase("my firebaseio.com/");
firebaseRef_ch.once("value", function(snapshot) {
// Should alert "Name of the parent: foo".
//alert("Name of the parent: " + getParent(snapshot));

});
`

hum

Just use this:

var newPostKey = firebase.database().ref().child('posts').push().key;

After that, use the variable because it contains the key.

how i could get all the key's name
any help?

You can get all the snapshot keys by
Object.keys(snapshot.val());

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