code: public function updateAction(Request $request, $id)
      {
          $em = $this->getDoctrine()->getManager();
          $user = $em->getRepository('Orkestra\Bundle\ApplicationBundle\Entity\User')->find($id);
  
          if (!$user) {
              throw $this->createNotFoundException('Unable to locate User');
          }
  
          $form = $this->createForm(UserType::class, $user, array('include_password' => false));
          $form->bind($request);
  
          if ($form->isValid()) {
              $em->persist($user);
              $em->flush();
  
              $this->get('session')->getFlashBag()->set('success', 'Your changes have been saved.');
  
              return $this->redirect($this->generateUrl('orkestra_user_show', array('id' => $id)));
          }
  
          return array(
              'user' => $user,
              'form' => $form->createView(),
          );
      }
docs: Edits an existing User entity.
  
  @Route("/{id}/update", name="orkestra_user_update")
  @Method("post")
  @Template("OrkestraApplicationBundle:User:edit.html.twig")
  @Secure(roles="ROLE_USER_WRITE")