php - Symfony2 - How to access the service in a custom console command?

Question

I am new to Symfony. I have created a custom command which sole purpose is to wipe demo data from the system, but I do not know how to do this.

In the controller I would do:

$nodes = $this->getDoctrine()
    ->getRepository('MyFreelancerPortfolioBundle:TreeNode')
    ->findAll();

$em = $this->getDoctrine()->getManager();
foreach($nodes as $node)
{
    $em->remove($node);
}
$em->flush();

Doing this from the execute() function in the command I get:

Call to undefined method ..... ::getDoctrine();

How would I do this from the execute() function? Also, if there is an easier way to wipe the data other than to loop through them and remove them, feel free to mention it.

Answer 1

为了能够访问服务容器，您的命令需要扩展Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand。

请参阅命令文档章节 -从容器获取服务。

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
// ... other use statements

class MyCommand extends ContainerAwareCommand
{
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $em = $this->getContainer()->get('doctrine')->getEntityManager();
        // ...

Answer 2

从Symfony 3.3（2017 年 5 月）开始，您可以轻松地在命令中使用依赖注入。

只需在您的: 中使用PSR-4 服务自动发现services.yml：

services:
    _defaults:
        autowire: true

    App\Command\:
        resource: ../Command

然后使用常见的构造函数注入，最后甚至Commands会有干净的架构：

final class MyCommand extends Command
{
    /**
     * @var SomeDependency
     */
    private $someDependency;

    public function __construct(SomeDependency $someDependency)
    {
        $this->someDependency = $someDependency;

        // this is required due to parent constructor, which sets up name 
        parent::__construct(); 
    }
}

自Symfony 3.4（2017 年 11 月）以来，这将（或已经这样做，取决于阅读时间）成为标准，届时命令将被延迟加载。