名为 isSubmitted 的未定义方法？ Symfony

Question

所以我之前做过这个，没有错误，可能是symfony2，现在是symfony3，可能不是相关问题，只是说。我该如何解决这个问题？

错误：

Attempted to call an undefined method named "isSubmitted" of class "Symfony\Component\Form\FormView".
500 Internal Server Error - UndefinedMethodException

代码：

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\AbstractType;
use AppBundle\Entity\Submission;
use Symfony\Component\Form\Extension\Core\Type\TextType;


use Symfony\Component\Form\Extension\Core\Type\FormType;
use Symfony\Component\HttpFoundation\Response;


use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\FormView;
use Symfony\Component\Form\FormInterface;


class DefaultController extends Controller
{
    /**
     * @Route("/", name="homepage")
     */
    public function indexAction(Request $request)
    {

        $variables = array();

        $submission = new Submission();
        $form = $this->createFormBuilder($submission)
            ->add('name', TextType::class)
            ->add('phonenumber', TextType::class)
            ->add('email', TextType::class)
            ->add('postal', TextType::class)
            ->add('housing', TextType::class)
            ->add('project', TextType::class)
            ->add('motivation', TextType::class)
            ->add('save', SubmitType::class, array('label' => 'Create submission'))
            ->getForm()->createView();


        var_dump($form->isSubmitted());
        die();
        if ($form->isSubmitted() && $form->isValid()) {
            print_r("yeay");
            die();
            $em = $this->getDoctrine()->getManager();
            $em->persist($submission);
            $em->flush();
        }


            // $variables['form'] = $form;
        // replace this example code with whatever you need
        return $this->render('AppBundle::main.html.twig', [
            'base_dir' => realpath($this->getParameter('kernel.root_dir').'/..'),
            'form' => $form,
        ]);
    }
}

Answer 1

您在表单视图而不是表单上调用了isSubmitted()。 form view 对象没有这个方法。

像这样创建表单：

$form = $this->createFormBuilder($submission)
    ->add('name', TextType::class)
    ->add('phonenumber', TextType::class)
    // ...
    ->getForm();

在将视图传递给模板之前创建视图：

return $this->render('AppBundle::main.html.twig', [
    'form' => $form->createView(),
]);