它在這裏說：控制器必須返回一個響應（null給出）。你忘了在控制器的某個地方添加一個return語句嗎？

Question

<?php 
namespace Acme\TaskBundle\Controller; 
use Symfony\Bundle\FrameworkBundle\Controller\Controller; 
use Acme\TaskBundle\Entity\Task; 
use Symfony\Component\HttpFoundation\Request; 


class DefaultController extends Controller 
{ 
    public function indexAction($name) 
    { 
    return $this->render('AcmeTaskBundle:Default:index.html.twig', array('name' => $name)); 
    } 

    public function newAction(Request $request) 
    { 
    // just setup a fresh $task object (remove the dummy data) 
    $task = new Task(); 
    $task->setTask('Write a blog post'); 
    $task->setDueDate(new \DateTime('tomorrow')); 

    $form = $this->createFormBuilder($task) 
     ->add('task', 'text') 
     ->add('dueDate', 'date') 
     ->getForm(); 

    if ($request->isMethod('POST')) 
    { 
     $form->bind($request); 

     if ($form->isValid()) 
     { 
     // perform some action, such as saving the task to the database 

     return $this->redirect($this->generateUrl('task_success')); 
     } 
    } 
    } 
} 

它在這裏說：控制器必須返回一個響應（null給出）。你忘了在控制器的某個地方添加一個return語句嗎？ 任何人都可以幫助我在此

Answer 1

如果if($request->isMethod('POST'))返回false你什麼都不做。所以當你第一次創建你的表單時（並且你沒有進入POST的情況），你會遇到這種情況，你必須返回一些東西給你的控制器動作調用者。

if ($request->isMethod('POST')) 
{ 
    $form->bind($request); 

    if ($form->isValid()) 
    { 
    // perform some action, such as saving the task to the database 
    return $this->redirect($this->generateUrl('task_success')); 
    } 
} 
// here, you have to return something (view,xml,redirect,etc...)