/**
  * Creates new relationship
  *
  * @role update
  */
 public function add()
 {
     $productID = $this->request->get('relatedownerID');
     $ownerID = $this->request->get('id');
     $owner = Product::getInstanceByID($ownerID, Product::LOAD_DATA);
     $product = Product::getInstanceByID($productID, Product::LOAD_DATA, array('ProductImage'));
     if ($product->isBundle()) {
         return new JSONResponse(array('error' => $this->translate('_err_bundle_with_bundle')));
     }
     if (!ProductBundle::hasRelationship($owner, $product)) {
         $instance = ProductBundle::getNewInstance($owner, $product);
         if (!$instance) {
             return new JSONResponse(array('error' => $this->translate('_err_add_to_itself')));
         }
         $instance->save();
         $response = new ActionResponse();
         $response->set('product', $product->toArray());
         $response->set('added', true);
         $response->set('total', $this->getTotal($owner));
         return $response;
     } else {
         return new JSONResponse(array('error' => $this->translate('_err_multiple')));
     }
 }