angular-leaflet-directive doesn't update markers when calling a function

Question

I'm very new to Angular and Leaflet.

I followed the example of iH8 from this question: how make ng-model="search" have influence on leaflet directive?

If this event is fired

function receiveMessage(event){
$scope.geojson.data = $filter('filter')($scope.data, 'name', 'some Value');
}

from another tab or frame with postMessage:

receiver.postMessage('value', 'URL')

the view changes and everything works fine. If I call this function locally or any other function with

$scope.geojson.data = $filter('filter')($scope.data, 'name', 'some Value');

nothing changes. Can someone explain me why?

Thanks in advance!