Real time syn between firebase3 and ionic1

ionic-v1
1

Hi all, I am writing a simple list to fetch firebase database using ionic 1 and it’s no problem. However, I would like to make the list auto-update whenever there are changes from firebase database. My code is as below and may I know is there any idea how to let the list update in real time syn? Many thanks.

newslist.js

$scope.$on('$ionicView.enter', function() {
$scope.news = [];
firebase.database().ref('news').limitToLast(100).once('value').then(function(news) {
        if (news.exists()) {
            
            news.forEach(function(account) {        
            
            var getnews = {
                  brief: account.val().brief,
                  details: account.val().details,
                  news_date:account.val().news_date,
                  thumbnail_url:account.val().thumbnail_url,
                  id: account.val().news_id
                };

            $scope.news.push(getnews);
            $scope.$apply();
          });
        }
      });
    });
  }
}

newslist.html

<div class="list card" ng-repeat=“new in news | orderBy:'-'">
<div class="item item-image" >
    <img src={{new.thumbnail_url}} >
  </a>
</div>
</div>