Symfony2:表单:绑定数据

我有一个简单的形式

    $transformer = new ModuleToArrayTransformer($this->entityManager);
    $builder->add('modules', 'collection', array(
        'type' => 'checkbox',
        'required' => false,
        'data' => $options['data'][0]->getModules(),
    ))
    ->add('save', 'submit', array(
        'label' => 'btn_update_and_edit_again',
        'attr' => array(
            'class' => 'btn btn-primary'
        )
    ))
    ->addViewTransformer($transformer);

和它的控制器：

 $em = $this->getDoctrine()->getManager();

    $user = $this->get('security.context')->getToken()->getUser();
    $module = $em->getRepository('AcmeProjectBundle:Module')
        ->findBy(
            array(
                'user' => $userId,
                'project' => $projectId,
            )
        );
    if (!$module) {
        $module = $this->createAction($projectId, $userId);
    }
    $userData = $em->getRepository('AcmeSonataUserBundle:User')->find($userId);
    $projectData = $em->getRepository('AcmeProjectBundle:Project')->find($projectId);
    $form = $this->createForm(new ModuleType($em), $module, array('user' => $userData, 'project' => $projectData));
    if ($request->getMethod() == 'GET') {
        if ($form->isValid()) {
        }
    }
    return $this->render('AcmeProjectBundle:Module:edit.html.twig', 
        array(
            'form' => $form->createView(),
            'projectId' => $projectId,
            'userId' => $userId,
        )
    );

该窗体与另一个窗体连接。当我单击第一个表单中的复选框时，会正确生成此表单。直到我试图$form->bind($request);

当我尝试绑定请求时，它显示"此值不正确">

$_GET似乎很好

array (size=1)
  'acme_projectbundle_module' => 
array (size=2)
  'modules' => 
    array (size=8)
      'stats' => string '1' (length=1) 
      'time' => string '1' (length=1) 
      'issues' => string '1' (length=1) 
      'metrics' => string '1' (length=1) 
      'timeLine' => string '1' (length=1) 
      'information' => string '1' (length=1) 
      'status' => string '1' (length=1) 
      'risks' => string '1' (length=1) 
  'save' => string '' (length=0) 

以及$request变量

如果表单看起来与我的$_GET请求完全一样，有什么问题？据我所知，$_GET 应该包含与$request->parameters字段相同的值。那应该是什么样子的？问题出在哪里？