Symfony 4.如何在没有依赖注入的情况下从控制器访问服务？ [英] Symfony 4. How to access the service from controller without dependency injection?

问题描述

我有几个服务：DieselCaseService，CarloanCaseService LvCaseService。

I have several services: DieselCaseService, CarloanCaseService LvCaseService.

控制器决定要获取哪些服务。

The controller decides which of services to get.

$type = $quickCheck["type"];
/**
 * @var $caseService \App\Service\Cases\CaseInterface
*/
$type = 'diesel; // for test purposes

$caseService = $this->get('case_service.' . $type);

服务别名的声明如下：

case_service.diesel:
    alias: App\Service\Cases\DieselCaseService
    public: true

class DieselCaseService implements CaseInterface 
{
.
.
.
}

如果我尝试获取DieselCaseService，则会收到错误消息

If I try to get the DieselCaseService, I get an error

服务 case_service.diesel未找到：即使它存在于

应用程序的容器中，该容器也位于
$中b $ b App\Controller\Api\AccountController是一个较小的服务定位器
，仅了解学说， form.factory，

fos_rest.view_handler ， http_kernel， parameter_bag，

request_stack，路由器， security.authorization_checker，

security.csrf.token_manager， security.token_storage ，序列化器，
会话，模板化和树枝服务。尝试使用dependency

注入。

Service "case_service.diesel" not found: even though it exists in the
app's container, the container inside
"App\Controller\Api\AccountController" is a smaller service locator that only knows about the "doctrine", "form.factory",
"fos_rest.view_handler", "http_kernel", "parameter_bag",
"request_stack", "router", "security.authorization_checker",
"security.csrf.token_manager", "security.token_storage", "serializer",
"session", "templating" and "twig" services. Try using dependency
injection instead.

我该怎么办？我不想将所有服务注入到控制器中。

What can I do? I don't want to inject all of the services to the controller

推荐答案

对于任何通过键来键入相同类型的多个实例在这种情况下，您可以使用自动装配阵列。

For any "multiple instances of same type by key" situation, you can use autowired array.

services:
    _defaults:
        autowire: true

    App\:
        resource: ../src

2。在构造函数中需要自动装配的数组

2. Require autowired array in Constructor

<?php

namespace App\Controller\Api;

use App\Service\Cases\DieselCaseService

final class AccountController
{
    /**
     * @var CaseInterface[]
     */
    private $cases;

    /**
     * @param CaseInterface[] $cases
     */
    public function __construct(array $cases)
    {
        foreach ($cases as $case) {
            $this->cases[$case->getName()] = $cases;
        }
    }

    public function someAction(): void
    {
        $dieselCase = $this->cases['diesel']; // @todo maybe add validation for exisiting key
        $dieselCase->anyMethod();
    }
}

3。在内核中注册编译器传递

自动连线数组功能不在Symfony内核中。感谢编译器传递。您可以编写自己的代码或使用以下代码：

3. Register compiler pass in Kernel

The autowired array functionality is not in Symfony core. It's possible thanks to compiler passes. You can write your own or use this one:

use Symplify\PackageBuilder\DependencyInjection\CompilerPass\AutowireArrayParameterCompilerPass;

final class AppKernel extends Kernel
{
    protected function build(ContainerBuilder $containerBuilder): void
    {
        $containerBuilder->addCompilerPass(new AutowireArrayParameterCompilerPass);
    }
}

就是这样！ ：）

我在所有项目中都使用了它，它的工作就像一个魅力。

I use it on all my projects and it works like a charm.

在我写的有关自动装配数组的帖子。

Read more in post about autowired arrays I wrote.

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