试图调用类“App\Twig\AppExtension”的名为“getDoctrine”的未定义方法

Question

我是学习 symfony4 的新手。我在树枝扩展中使用该学说时遇到问题。如何在树枝扩展中使用教义查询。

请帮我如何配置此代码的服务

namespace App\Twig;

use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;
use Twig\TwigFunction;

class AppExtension extends AbstractExtension
{
     public function getFilters(): array
    {
        return [
            // If your filter generates SAFE HTML, you should add a third
            // parameter: ['is_safe' => ['html']]
            // Reference: https://twig.symfony.com/doc/2.x/advanced.html#automatic-escaping
            new TwigFilter('filter_name', [$this, 'doSomething']),
        ];
    }

    public function getFunctions(): array
    {
        return [
            new TwigFunction('followed', [$this, 'doSomething']),
        ];
    }

    public function doSomething($id, $admin)
    {
        // ...
        $follower = $this->getDoctrine()->getRepository(Follower::class)->findAll();
        foreach( $follower as $value ){
            if($value['user']==$admin && $value['followed_user']==$id) return false;
        }
        return true;
    }
}

这是我的树枝功能代码

{% if followed(users.id, app.user.id) %}

运行页面时出现错误 试图调用“App\Twig\AppExtension”类的名为“getDoctrine”的未定义方法。

请帮我提供解决方案

Answer 1

我用了这个，现在问题解决了

    use Doctrine\Common\Persistence\ManagerRegistry;

    public function doSomething($id, $admin)
    {
        // ...
        $follower = $this->em->getRepository(Follower::class)->findBy([
            'followed_user' => $id,
            'user' => $admin
        ]);

        if(sizeof($follower)>0) return false;
        else return true;
    }

Answer 2

getDoctine 是在AbstractController（或ControllerTrait 准确地说）中定义的函数，在 Twig 扩展上不可用。您需要将doctrine 服务注入您的班级。为简洁起见，您的大部分代码都被省略了：

use Doctrine\Common\Persistence\ManagerRegistry;

class AppExtension extends AbstractExtension
{
    private $em;

    public function __construct(ManagerRegistry $registry)
    {
        $this->em = $registry;
    }

    public function doSomething($id, $admin)
    {
        $follower = $this->em->getRepository(Follower::class)->findAll();
        // ...
    }
}