Symfony 3.4：在 EventListener 中访问原则

Question

我正在尝试访问测试数据库 table 的 EventListener 中的学说，如果它无效，那么用户将被重定向到一个配置页面，他将在其中解决问题！[=12= ]

测试将在每次调用控制器之前执行，所以我将使用事件 kernel.controller:

[已编辑：已解决，测试和重定向非常好]

<?php

namespace AdminBundle\EventListener;

use Symfony\Bundle\FrameworkBundle\Routing\Router;
use Doctrine\ORM\EntityManager;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpFoundation\Session\Session;

class BuildReferencesEventListener
{
    /**
     * @var EntityManager
     */
    protected $em;
    /**
     * @var Router
     */
    protected $router;
    protected $references = [
        1 => 'oxygen',
        2 => 'pH',
        3 => 'pCO2'
    ];
    protected $redirect_route = 'references';
    protected $requestStack;
    protected $session;

    public function __construct(EntityManager $entityManager, Router $router, RequestStack $requestStack, Session $session)
    {
        $this->em = $entityManager;
        $this->router = $router;
        $this->requestStack = $requestStack;
        $this->session = $session;
    }

    public function onKernelController()
    {
        $em = $this->em;
        $savedReferences = $em->getRepository('AdminBundle:ParamReference')->findAll();
        $references = $this->references;

        if (count($savedReferences) <= 0){
            $this->redirect();
        }

        for ($i =0; $i<count($savedReferences); $i++){
            if ($savedReferences[$i] !== $references[$i]) {
                $this->redirect();
            }
        }
    }

    public function redirect()
    {
        $request = $this->requestStack->getCurrentRequest();
        $route = $request->get('_route');
        $this->session->getFlashBag()->add('warning', 'You need to setup the references for the parameters before starting the work');
        if ($route != 'references'){
            $url = $this->router->generate('references');
            $redirect = new RedirectResponse($url);
            $redirect->send();
        }
    }
}

这里是services.yml

build.references:
    class: AdminBundle\EventListener\BuildReferencesEventListener
    arguments: ['@doctrine.orm.entity_manager', '@router', '@request_stack', '@session']
    tags:
        - { name: kernel.event_listener, event: kernel.controller, method: onKernelController }

Answer 1

在您的 service.yml 事件侦听器服务部分添加参数

Your.service:
    Class: AdminBundle\EventListener\BuildReferencesEventListener
    arguments: ['@doctrine.orm.entity_manager']
    tags:
        - { name: kernel.event_listener, event: kernel.controller }

并在您的侦听器中添加此 __cunstruct 代码：

namespace AdminBundle\EventListener;
use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
use Doctrine\ORM\EntityManager;

class BuildReferencesEventListener
{

    protected $em;

    function __construct(EntityManager $em)
    {
        $this->em = $em;
    }

    public function onKernelController(FilterControllerEvent $event)
    {
        //TO DO call doctrine
        // $em = Enity Manager...
        // $em->getRepository...
        // I hope its clear enough what im trying to do
    }

Answer 2

在 Symfony 3.4 及更高版本中，默认情况下启用自动装配，因此您只需向服务的构造方法添加一个类型提示参数和一个私有属性以将参数的值分配给。

use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpKernel\Event\FilterControllerEvent;

class BuildReferencesEventListener
{
    private $em;

    public __construct(EntityManagerInterface $em)
    {
        $this->em = $em;
    }

    public function onKernelController(FilterControllerEvent $event)
    {
        $em = this->em;
        // [...]
    }

}

如果你需要显式声明参数，您可以在服务配置中这样做：

# config/services.yaml
services:
    # ... same code as before

    # explicitly configure the service
    AdminBundle\EventListener\BuildReferencesEventListener:
        arguments:
            $em: '@doctrine.orm.entity_manager_interface'

这对于传递服务容器不知道的参数可能很有用。

要了解有关服务容器的更多信息，https://symfony.com/doc/3.4/service_container.html#injecting-services-config-into-a-service。

Symfony 3.4：在 EventListener 中访问原则

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