Firebase as array orderby not returning data

ionic-v1
1

Hi , am implementing a comment feature ,on my app
am using firebase as the backend ,i can seem to able to orderby a key

.factory("items", function($firebaseArray) {
var itemsRef = new Firebase("https//buzzgh.firebaseio.com/comments");
return itemRef ;
})

.controller('tdCtrl', function($scope, FeedList,$firebaseArray, $stateParams, dataStore, feedSources, $ionicModal, items) {
   $scope.feeds = FeedList.get(feedSources.top, dataStore.topfeeds);
   $scope.feed = $stateParams.feed;
   $scope.item = $stateParams.item;
   $scope.items=$firebaseArray(items);
   var id=parseInt($scope.feeds[$scope.feed].$$hashKey.slice(7) + $scope.feeds[$scope.feed].entries[$scope.item].$$hashKey.slice(7));

   $scope.items = items.orderByChild("hashKey").equalTo(parseInt($scope.feeds[$scope.feed].$$hashKey.slice(7) + 
   $scope.feeds[$scope.feed].entries[$scope.item].$$hashKey.slice(7))).on("child_added", function(snapshot) {
});

this is how am doing posting

    $scope.postComment = function() {
    $scope.itemsadd=$firebaseArray(items);

    $scope.comment.username = "wasiu";
    $scope.comment.hashKey=parseInt($scope.feeds[$scope.feed].$$hashKey.slice(7) + $scope.feeds[$scope.feed].entries[$scope.item].$$hashKey.slice(7));
    $scope.itemsadd.$add($scope.comment);
    // console.log($scope.feeds[$scope.feed].$$hashKey.slice(7) + $scope.feeds[$scope.feed].entries[$scope.item].$$hashKey.slice(7));
    $scope.comment = {};
    $scope.closeComment();
};

but this logic does not work even thought posting to firebase works

what am really trying to achieve is to hav a comment section which isolate and return specific data using hashkey