Symfony 4 中的外部服务配置 [英] External service configuration in Symfony 4

问题描述

我正在尝试使用 services.yaml 中的导入将一些服务定义移动到单独的文件中.您可以在 symfony 文档中找到此内容.

I'm trying to use imports in services.yaml to move some services definitions to separate file. Here you can find this in symfony doc.

但是当我尝试执行此操作时出现错误:

But when i'm trying to do this I'm getting an error:

无法自动装配服务App\Domain\Test\Test":方法__construct()"的参数$param"必须具有类型提示或明确给出一个值.

Cannot autowire service "App\Domain\Test\Test": argument "$param" of method "__construct()" must have a type-hint or be given a value explicitly.

这是我的配置文件:

# services.yaml
imports:
    - { resource: services/test.yaml }

services:
    _defaults:
        autowire: true      
        autoconfigure: true 
        public: false       

    App\:
        resource: '../src/*'
        exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'

    App\Controller\:
        resource: '../src/Controller'
        tags: ['controller.service_arguments']

和

# test.yaml
parameters:
    param: 'some param'

services:
    App\Domain\Test\Test:
        public: true
        autowire: true
        arguments:
            $param: '%param%'

这里是服务:

namespace App\Domain\Test;

class Test
{
    private $mailer;
    private $param;

    public function __construct(\Swift_Mailer $mailer, string $param)
    {
        $this->mailer = $mailer;
        $this->param = $param;
    }
}

如果我将参数和服务移动到 services.yaml 中，这将运行良好.有人知道我做错了什么吗?

This is working well if I move parameters and service into services.yaml. Do somebody know what I'm doing wrong?

推荐答案

问题是您的第一个文件尝试将您的服务加载为服务，并且无法自动填充参数 string $param.

The problem is that your first file try to load as service your service and can't fill automatically the parameter string $param.

一个好的解决方法可能是排除您的服务:

A good fix may be to exclude your service:

services:
    App\:
        resource: '../src/*'
        exclude: '../src/{Entity,Migrations,Tests,Kernel.php,Domain/Test.php}'

另一种解决方案是简单地将此定义放在 services.yaml 文件中.

Another solution is to simply put this definition inside the services.yaml file.

您也可以考虑加载 App\Something\: 而不是完整的命名空间，但如果您尝试在跨命名空间定义中自动装配，这会带来缺点.(某些功能可能无法按预期工作)

You may also consider to load App\Something\: instead of the complete namespace but this has drawbacks if you try to autowire in cross-namespaces definitions. (some features may not work as expected)

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