AngularJS: Including multiple controllers in a directive.

directive- multiple-controllers.js

app.directive('myDirective', function () {
  return{
    restrict: "A",
    require:['^parentDirective', '^ngModel'], 
    link: function ($scope, $element, $attrs, controllersArr) {

      // parentDirective controller
      controllersArr[0].someMethodCall(); 

      // ngModel controller         
      controllersArr[1].$setViewValue(); 
    }
  }
});