我如何使用函数isClicked（）来填充数据库？

public function addAction(){

  $em = $this -> getDoctrine() -> getEntityManager();
  $a = new Button;
  $form = $this -> createForm(new ButtonType());

  $request = $this->get('request');
  $value=0;
  if($request->getMethod() == 'POST'){
    $form->handleRequest($request);
    $value = $form->get('addButton')->isClicked();
    echo $value;
    if($value =1){
      $a ->setTextBox(1)
     ->setPlainText(1)
     ->setCheckBox(1)
     ->setRadio(1)
     ->setButton(1);
      $em ->persist($a);
        $em ->flush();
    }
  }    

  return $this->render('PagePageBundle:Default:add.html.twig', array( 'form' => $form -> createView(),));
}
public function addAction(){

  $em = $this ->