Ember JS - routing from resourse to route

i'm trying to update and ember project from version 2.x to version 3.x, and one of my first issue is that in the route file i get this.resouce is not defined. i belive this was deprecated. the code looks like this :

  this.route('objects', function () {
    this.route('search', { path: '/' }, function () {
      this.resource('objects.items', { path: '/:search_id' }, function () {
        this.resource('objects.item', { path: '/item/:item_id'}, function () {
          this.route('general', { path: '/' });
          this.route('tab', { path: '/tab/:tab' });
          this.route('relations');
          this.route('diagram');
          this.route('comments');
          this.route('sources');
          this.route('views');
        });
      });
    });
  });

i've tried to simply change the resource to route and give resetNameSpace: true attribute, but didn't help. also i've tried various combinations, but without luck. anyone with experience can help me redo this routing to be compatible with the latest ember?

thanks!