symfony的序列化和標準化使得JSON不相容

Question

當試圖使該序列化對象的功能，把它變成一個JSON並把它作爲一個HTTP響應我得到以下錯誤：

ContextErrorException

Runtime Notice: Declaration of AppBundle\Controller\DefaultController::json() should be compatible with Symfony\Bundle\FrameworkBundle\Controller\Controller::json($data, $status = 200, $headers = Array, $context = Array)

我能通過var_dump（）顯示用戶數組;在我試圖序列化對象並在函數中使用它之前。這是我的代碼：

<?php 

namespace AppBundle\Controller; 

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route; 
use Symfony\Bundle\FrameworkBundle\Controller\Controller; 
use Symfony\Component\HttpFoundation\Request; 
use Symfony\Component\HttpFoundation\Response; 
use Symfony\Component\Serializer\Serializer; 
use Symfony\Component\Serializer\Encoder\XmlEncoder; 
use Symfony\Component\Serializer\Encoder\JsonEncoder; 
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer; 

class DefaultController extends Controller 
{ 

public function indexAction(Request $request) 
{ 
    // replace this example code with whatever you need 
    return $this->render('default/index.html.twig', [ 
    'base_dir' =>realpath($this->getParameter('kernel.project_dir')).DIRECTORY_SEPARATOR, 
]); 
} 


public function pruebasAction(Request $request) 
{ 
    $em = $this->getDoctrine()->getManager(); 
    $users = $em->getRepository('BackendBundle:User')->findAll(); 

    return $this->json($users); 

} 

public function json($data){ 
    $normalizers = array(new ObjectNormalizer()); 
    $encoders = array(new JsonEncoder()); 
    $serializer = new Serializer($normalizers, $encoders); 
    $json = $serializer->serialize($data, 'json'); 

    $response = new Response($json); 
    $response->headers->set('Content-Type', 'application/json'); 

    return $response; 

} 
} 

「public function json（$ data）{}」做了什麼來搞亂程序？
以及如何讓我的JSON與框架中的JSON兼容？

P.D .:要有耐心。我是新與框架

Answer 1

我只是改變了過去公共職能（JSON用於jsons）的名稱和它的工作，它給了我一個可讀的JSON輸出：

<?php 

    namespace AppBundle\Controller; 

    use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route; 
    use Symfony\Bundle\FrameworkBundle\Controller\Controller; 
    use Symfony\Component\HttpFoundation\Request; 
    use Symfony\Component\HttpFoundation\Response; 
    use Symfony\Component\Serializer\Serializer; 
    use Symfony\Component\Serializer\Encoder\XmlEncoder; 
    use Symfony\Component\Serializer\Encoder\JsonEncoder; 
    use Symfony\Component\Serializer\Normalizer\ObjectNormalizer; 

    class DefaultController extends Controller 
    { 

    public function indexAction(Request $request) 
    { 
     // replace this example code with whatever you need 
     return $this->render('default/index.html.twig', [ 
     'base_dir' =>realpath($this->getParameter('kernel.project_dir')).DIRECTORY_SEPARATOR, 
     ]); 
    } 


    public function pruebasAction(Request $request) 
    { 
    $em = $this->getDoctrine()->getManager(); 
    $users = $em->getRepository('BackendBundle:User')->findAll(); 

    return $this->jsons($users); 

    } 

    public function jsons($data){ 
     $normalizers = array(new ObjectNormalizer()); 
     $encoders = array(new JsonEncoder()); 
     $serializer = new Serializer($normalizers, $encoders); 
     $json = $serializer->serialize($data, 'json'); 

     $response = new Response($json); 
     $response->headers->set('Content-Type', 'application/json'); 

     return $response; 

     } 
    }