/**
  * @param FieldEvent $resourceEvent
  */
 public function onSave(FieldEvent $resourceEvent)
 {
     $container = $resourceEvent->getContainer();
     $field = $resourceEvent->getField();
     $formValue = $resourceEvent->getValue();
     $value = $formValue['containerTo'];
     if ($formValue && $field) {
         //remove containers
         $this->objectManager->getRepository('BigfishEavBundle:Container')->removeRelatedContainers($container, $field);
         //save related containers
         $this->objectManager->getRepository('BigfishEavBundle:Container')->saveRelatedContainers($container, $field, $value);
     }
 }