firebase database child reference issue - angularjs

Question

I am trying to create a meeting firebase reference inside my parent users
I am implementing this line:
var meetingRef= firebase.database().ref('users/' + $rootScope.currentUser.$id + '/meetings');
Under my users, I have registered user Id's as hashes, which I make use of in the above code. As the current user gets authenticated, he gets to create some meetings from the UI. I want these meetings to go into his particular hash in the firebase database.
But every time I create a meeting, some undefined child reference of users gets created under which I see the meetings of authenticated users.
This is my complete code-
myApp.controller("MeetingsController",
['$scope','$rootScope','$firebaseArray',
function($scope,$rootScope,$firebaseArray){
var ref = firebase.database().ref();
var auth = firebase.auth();
auth.onAuthStateChanged(function(user) {
if (user) {
var meetingRef= firebase.database().ref('users/' + $rootScope.currentUser.$id + '/meetings');
var meetingsInfo=$firebaseArray(data);
$scope.addmeeting=function(){
meetingsInfo.$add({
name:$scope.meetingname,
date:firebase.database.ServerValue.TIMESTAMP
}).then(function(){
$scope.meetingname=' ';
})
};
}
});
}]);
If you are wondering as to where that $rootScope.users.$id value is coming. It comes from a service that I created and the $id is the value that the current authenticated user's hash is.
I want the meetings to go inside authenticated users hash. I think I am creating wrong reference path. How can I achieve this one?
Images attached:
Current:
Required:

Answer 1

Aakash,
Your code to create the meetings folder and the drawing you added to the post do not go together. Currently, you are using this:
var data = firebase.database().ref('users/' + $rootScope.currentUser.$id + '/meetings');
But if you really want meetings to be a direct child of users the way you have drawn then you will need to get rid of the user id piece of the reference like this:
var data = firebase.database().ref('users/meetings');
This is based off what you added to your post, however, something tells me that you didn't mean to draw meetings in there as a direct child to users. If that's what you really wanted, then that would be your answer.
This next piece is a guess, but is the following structure what you are trying to create?
Because if it is, you need something different which I can also help with, just let me know.
Update:
Ok, based on your comment, I see that you are going for the data structure in my picture.
It looks like your code is ok, however, at the exact moment that the data variable is being set, your $rootScope.currentUser.$id is undefined. This is possibly due to the asynchronous nature of javascript. This means that sometimes your user variable is true, however, your $rootScope.currentUser.$id is still not quite caught up and is undefined.
I would run a check on the variable before continuing, just to make sure everything is in order:
if($rootScope.currentUser.$id != undefined){
var data = firebase.database().ref('users/' + $rootScope.currentUser.$id + '/meetings');
}else{
return;
}
This will stop you from ever getting a new undefined object in your database.

Answer 2

I have found an answer to this one.
I changed the meetingRef to:
var meetingRef = firebase.database().ref('users/' + user.uid + '/meetings');
and it worked for me.