Symfony 2服务容器为空

时间:2014-01-15 05:13:54

标签: php symfony

我是Symfony 2的新手,并尝试创建一些简单的应用程序来学习。我创建了一个包GoogleApiBundle。在捆绑包内,我有一个控制器YouTubeController,这是一个服务:

//services.yml
service:
    myname_googleapi_youtube:
        class: Myname\GoogleApiBundle\Controller\YouTubeController

在另一个包中,我尝试在YouTubeController

中调用一个函数
//anotherController.php
$service = $this->get('myname_googleapi_youtube');
$result = $service->getResultFunction();

//YouTubeController.php
public function getResultFunction()
{
    $parameter = $this->container->getParameter('a');
    //...
}

然后我收到例外FatalErrorException: Error: Call to a member function getParameter() on a non-object ...,因为$this->containerNULL

我搜索但没有得到答案。我做错了吗?

1 个答案:

答案 0 :(得分:5)

//services.yml
service:
    myname_googleapi_youtube:
        class: Myname\GoogleApiBundle\Controller\YouTubeController
        arguments: [@service_container]

你会:

<?php

namespace Myname\GoogleApiBundle\Controller

use Symfony\Component\DependencyInjection\ContainerInterface;

class YouTubeController
{
    /**
    * @param ContainerInterface $container
    */
    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    /**
    * Obtain some results
    */
    public function getResultFunction()
    {
        $parameter = $this->container->getParameter('a');
        //...
    }

    /**
    * Get a service from the container
    *
    * @param string The service to get
    */
    protected function get($service)
    {
        return $this->container->get($service);
    }
}

这种做法很有争议,所以我建议您快速阅读以下内容: