saving newly created nested records to a relation

addActor.js

addActor: function() {
  ........
  var actor = this.actorNestedStore.createRecord(Bw.AssignmentActor, {});
  this.newActors.pushObject(actor);
  ............
}

gistfile1.js

    saveAssignment: function() {
        this.nestedStore.commitChanges();
	//newActors bevat de objecten die in de nested store zijn aangemaakt
	this.newActors.forEach(function (actor) {
		Bw.editAssignmentController.get('actors').pushObject(Bw.store.find(actor));
	});
	Bw.store.commitRecords();
        this.closeAssignment();
    }