/**
  * Sort options
  *
  * @return JSONResponse
  */
 public function sort()
 {
     $target = $this->request->get('target');
     foreach ($this->request->get($target, array()) as $position => $key) {
         if (!empty($key)) {
             $productOption = ProductOption::getInstanceByID((int) $key);
             $productOption->setFieldValue('position', (int) $position);
             $productOption->save();
         }
     }
     return new JSONResponse(false, 'success');
 }