angularfire - Digest is not triggered when scope variable is updated in AngularJS -

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i using angularjs , angularfire show list of tasks:

<ul ng-repeat="tool in tools">     <li>{{tool.name}} {{ tool.description}}</li> </ul>  var toolref = new firebase(dbref + "/tools/" + toolid); toolref.once('value', function(snapshot) {       console.log(angular.tojson(snapshot.val()));       $scope.tools.push(snapshot.val());       //$scope.$apply(); });

http://jsfiddle.net/oburakevych/5n9mj/11/

code simple: bind 'site' object firebase db. object contains list of id of relevant tools. load every tool in $scope.tools variable , use ng-repeat show them in ui. however, every time push new entry $scope.tools - dom not updated. have call $scope.$apply trigger digest after every push - see commented out line 18 , works.

it's strange since sow several times , scope variables bound angularfire.

can explain this? doing wrong?

because change scope outside of angularjs, must use $scope.$apply() inform angular scope changes. common way handle that. use error handling of angularjs wrap code in callback function like:

$scope.$apply(function(){   $scope.tools.push(snapshot.val()); });

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