如何使用FOSRestBundle以JSON格式返回或显示数据

我正在使用Symfony2和FOSRestBundle在Restful API中工作。我已经阅读了视图层文档，但不清楚如何处理API的输出。我要实现的目标很简单：将结果显示或返回或输出为有效JSON。这是我在控制器上的功能：

<?php

/**
 * RestAPI:       Company.
 */
namespace PDI\PDOneBundle\Controller\Rest;

use FOS\RestBundle\Controller\FOSRestController;
use FOS\RestBundle\Request\ParamFetcherInterface;
use Nelmio\ApiDocBundle\Annotation\ApiDoc;
use FOS\RestBundle\Controller\Annotations\QueryParam;
use FOS\RestBundle\Controller\Annotations\Get;

class CompanyRestController extends FOSRestController
{
    /**
     * Gets all companies.
     *
     * @return array
     *
     * @ApiDoc(
     *   resource = true,
     *       https = true,
     *   description = "Gets all companies",
     *   statusCodes = {
     *      200 = "Returned when successful",
     *      400 = "Returned when errors"
     *   }
     * )
     * @Get("/api/v1/companies")
     *
     */
    public function getCompaniesAction()
    {
        $response = array();
        $em = $this->getDoctrine()->getManager();
        $entities = $em->getRepository('PDOneBundle:Company')->findAll();

        if ($entities) {
            foreach ($entities as $entity) {
                $response['companies'][] = [
                    'id' => $entity->getId(),
                    'createdAt' => $entity->getCreatedAt(),
                    'updatedAt' => $entity->getUpdatedAt(),
                    'name' => $entity->getName(),
                    'logo_url' => $entity->getLogoUrl(),
                    'division' => $entity->getDivision(),
                    'inactive' => $entity->getInactive(),
                ];
            }

            $response['status'] = 'ok';
        } else {
            $response['status'] = 'error';
        }

        return $response;
    }
}

如果我尝试此URL：/app_dev.php/api/v1/companies.json我收到404错误：

{"code":404,"message":"No route found for \"GET\/api\/v1\/companies.json\""}

如果我尝试以下URL：https://reptool.dev/app_dev.php/api/v1/companies错误打开：

找不到模板“”。500内部服务器错误-InvalidArgumentException 3个链接的异常：Twig_Error_Loader»InvalidArgumentException»InvalidArgumentException»

我也检查了FOSRestBundleByExample，但没有太多帮助。

我在这里想念的是什么？我如何实现我所需要的？有什么建议吗？

FOSRest配置

我忘记在以下位置添加FOSRestBundle config.yml：

#FOSRestBundle
fos_rest:
    param_fetcher_listener: true
    body_listener: true
    format_listener:
        rules:
            - { path: ^/, priorities: [ json, html ], fallback_format: ~, prefer_extension: true }
        media_type:
            version_regex: '/(v|version)=(?P<version>[0-9\.]+)/'

    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