/**
* delete stock entity from the product detail table
* @Route("/delete_stock_2/{id}",name="deletestock2")
* @ParamConverter("stock", class="AppBundle:Stock")
*/
public function delete_stock_2(Stock $stock)
{
$user_id = $stock->getUser()->getId();
$em = $this->getDoctrine()->getManager();
$em->remove($stock);
$em->flush();
echo "<script>alert('删除成功!')</script>";
return $this->redirectToRoute('productdetail', array('id' => $user_id));
}