将查询字符串数据传递给表单

Question

我试图在我的表单中使用查询字符串给出的一些数据。我在网上搜索并找到了一个很好的解释(http://bicknoyle.com/2014/04/passing-query-string-params-form-symfony/):

class RegistrationFormType extends BaseType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);
        $builder->add('refer', 'user_refer_type');
        $builder->addEventListener(FormEvents::POST_SET_DATA, function(FormEvent $event) use ($options) {
            if (isset($options['request'])) {
                $form = $event->getForm();
                $form->get('source')->setData($options['request']->query->get('source'));
            }
        });
    }
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setOptional(array(
            'request'
        ));
        $resolver->setAllowedTypes(array(
            'request' => 'SymfonyComponentHttpFoundationRequest'
        ));
    }

我找到了使用请求作用域的另一种方法:

class RegistrationFormType extends BaseType
{
    private $request = null;
    public function __construct(Request $request)
    {
        $this->request = $request;
    }
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);
        $builder->add('refer', 'user_refer_type');
        $builder->addEventListener(FormEvents::POST_SET_DATA, function (FormEvent $event)
        {
            $form = $event->getForm();
            $form->get('refer')->setData($this->request->query->get('refer'));
        });
    }

我有一些关于代码的问题:

1. 什么是"更好"的方式来实现这样的事情?
   总的来说，我可以总结，第一种方法需要访问控制器来传递请求对象，第二种方法需要请求范围。
2. 我错过了另一个好方法吗?

Answer 1

我建议使用第二种方法，但不是注入Request对象，而是根据这篇文章注入RequestStack服务。

下面是一些我通常怎么做的例子:

class CustomType extends AbstractType
{
    /**
     * @var RequestStack
     */
    private $requestStack;
    /**
     * @param RequestStack $requestStack
     */
    public function __construct(RequestStack $requestStack)
    {
        $this->requestStack = $requestStack;
    }
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $currentRequest = $this->requestStack->getCurrentRequest();
        ...
        $builder->addEventListener(FormEvents::POST_SET_DATA, function (FormEvent $event) use ($currentRequest)
        {
            $form = $event->getForm();
            $form->get('refer')->setData($currentRequest->query->get('refer'));
        });
    }
    ...
}