传递给Symfony \ Component \ Form \ FormRenderer :: renderBlock（）的参数1必须是... \ FormView的实例，...的实例给出

Question

由于标题最大字符，整个错误缺少命名空间Symfony \ Component \ Form，它被3个点替换。

所以，我遵循docs中提供的步骤，我无法找到我得到的错误的来源。如果有人能提供帮助，我会非常感激。

这是我的AuthController的方法

/**
 * @Route("/register", name="registrationPage")
 */
public function showRegistrationPage(Request $request)
{
    return $this->render('auth/register.html.twig', [
        'register_form' => $this->createForm(RegisterType::class, (new UserInformation()))
    ]);
}

这是方法，我在其中声明表单

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('firstname', TextType::class, ['attr' => ['class' => 'form-control']])
        ->add('secondname', TextType::class, ['attr' => ['class' => 'form-control']])
        ->add('email', EmailType::class, ['attr' => ['class' => 'form-control']])
        ->add('password', PasswordType::class, ['attr' => ['class' => 'form-control']])
        ->add('password_confirmation', PasswordType::class, [
            'label' => 'Confirm Password',
            'attr' => ['class' => 'form-control'],
            'mapped' =>false
        ])
        ->add('Register', SubmitType::class, ['attr' => ['class' => 'btn btn-primary']]);

}

Answer 1

/**
 * @Route("/register", name="registrationPage")
 */
public function showRegistrationPage(Request $request)
{
    $form = $this->createForm(RegisterType::class, (new UserInformation());

    return $this->render('auth/register.html.twig', [
        'register_form' => $form->createView()
    ]);
}

http://symfony.com/doc/current/forms.html#building-the-form

Answer 2

缺少的部分是createView（）方法

/**
 * @Route("/register", name="registrationPage")
 */
public function showRegistrationPage(Request $request)
{
    return $this->render('auth/register.html.twig', [
        'register_form' => $this->createForm(RegisterType::class, (new UserInformation()))->createView()
    ]);
}