title: Serialize POST request body into array with FOSRestBundle
body: <p>I am trying to make a Rest web service using Symfony 3 and FOSRestBundle.<br>
  I come from a Spring + Jackson background so i'm trying to make it so that you can pass objects to controllers as request body that become function parameters and return objects that get serialized into json, so far i managed to make it work for everything except for arrays.<br>
  This is my code:</p>
  
  <p>configuration:</p>
  
  <pre><code>#FOSRestBundle
  fos_rest:
      param_fetcher_listener: true
      body_listener: 
          enabled: true
          decoders:
              json: fos_rest.decoder.json
      format_listener:
          rules:
              - { path: ^/, priorities: [ json ], fallback_format: json, prefer_extension: true }
  
      body_converter:
          enabled: true
          #validate: true
  
      view:
          mime_types:
              json: ['application/json', 'application/json;version=1.0', 'application/json;version=1.1']
          view_response_listener: 'force'
          formats:
              xml:  false
              json: true
          templating_formats:
              html: true
  
      exception:
          codes:
              'Symfony\Component\Routing\Exception\ResourceNotFoundException': 404
              'Doctrine\ORM\OptimisticLockException': HTTP_CONFLICT
          messages:
              'Symfony\Component\Routing\Exception\ResourceNotFoundException': true
      allowed_methods_listener: true
      access_denied_listener:
          json: true
  </code></pre>
  
  <p>This is the controller</p>
  
  <pre><code>&lt;?php
  
  namespace AppBundle\Controller;
  
  use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
  use Symfony\Bundle\FrameworkBundle\Controller\Controller;
  use Symfony\Component\HttpFoundation\Request;
  use JMS\DiExtraBundle\Annotation\Inject;
  use FOS\RestBundle\Controller\Annotations\Post;
  use FOS\RestBundle\Controller\Annotations\View;
  use FOS\RestBundle\Controller\FOSRestController;
  use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
  
  class DefaultController extends FOSRestController {
  
      /**
       * @Post("/rest", name="rest_test")
       * @ParamConverter("myArr", converter="fos_rest.request_body")
       * @View
       * @param Request $request
       */
      public function restAction(Request $request, array $myArr) {
          return $myArr;
      }
  }
  </code></pre>
  
  <p>When i try to call this from my rest client (putting <code>[1, 2]</code> as request body) i receive this error:</p>
  
  <pre><code>{
    "code": 500,
    "message": "Converter 'fos_rest.request_body' does not support conversion of parameter 'myArr'."
  }
  </code></pre>
  
  <p>If i turn <code>myArr</code> into an object (that is i change its type from <code>array</code> to <code>MyObject</code>, containing the <code>number</code> variable <code>myVar</code>) and send data that reflects that object structure (such as <code>{"myVar": 2}</code> ) it works fine, but it doesn't work with an array. </p>