config.yml 中的依赖注入

Question

我有两个服务，我想从 config.yml 传递我的参数

我的 config.yml

parameters:
    MyService.class:      Acme\UserBundle\Services\sendEmail
    MyService.arguments:  @mailer

    NewUserListener.class:  Acme\UserBundle\Event\NewUserListener
    NewUserListener.arguments:  @MyService

我在 bundle 中的 service.yml

services:
MyService:
    class:        %MyService.class%
    arguments:    [%MyService.arguments%]

NewUserListener:
    class: %NewUserListener.class%
    arguments:    [%NewUserListener.arguments%]
    tags:
        - { name: kernel.event_listener, event: new.user, method: sendEmailToUsers }

我遇到了一个错误

您不能转储带有包含对参数的引用的容器 其他服务

我的问题是：

• 如何从 config.yml 注入我的参数？
• 在哪里可以找到像@mailer 这样的“全球服务”列表？我在文档中找不到

Answer 1

您不能在参数中引用服务。您应该将%MyService.arguments% 替换为@mailer。

要查找所有可用服务，请运行 php app/console container:debug

Answer 2

这有点复杂！

首先，您必须像这样声明您的默认服务（我更改了所有名称以符合 Symfony2 的约定）：

# resources/config/services.yml

services:
    my_own.service.default.class: Acme\UserBundle\Services\sendEmail
    my_own.user_listener.default.class: Acme\UserBundle\Event\NewUserListener

services:
    my_own.service.default:
        class: %my_own.service.default.class%
        arguments: [@mailer]

    my_own.user_listener:
        class: %my_own.user_listener.class%
        arguments: [@my_own.service]
        tags:
            - { name: kernel.event_listener, event: new.user, method: sendEmailToUsers }

我们将define some configuration for your bundle 以允许更改使用的服务：

namespace My\OwnBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

/**
 * This is the class that validates and merges configuration from your app/config files
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html#cookbook-bundles-extension-config-class}
 */
class Configuration implements ConfigurationInterface
{
    /**
     * {@inheritDoc}
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('my_own');

        // Here you should define the parameters that are allowed to
        // configure your bundle. See the documentation linked above for
        // more information on that topic.
        $rootNode
            ->children()
                ->scalarNode('service')->defaultValue('my_own.service.default')->end()
                ->scalarNode('user_listener')->defaultValue('my_own.user_listener.default')->end()
            ->end();

        return $treeBuilder;
    }
}

请注意，默认情况下，我们使用上面在捆绑包中定义的默认服务。

您现在可以使用以下内容更改您的服务（在您的app/config.yml 中），例如：

# app/config.yml

my_own:
    service: my_other.service
    user_listener: my_other.user_listener

当然，您可以根据需要在您的包或另一个包中定义服务my_other.service 和my_other.user_listener。

现在我们必须告诉如何使用这个配置来获取想要的服务：

namespace My\OwnBundle\DependencyInjection;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader;

/**
 * This is the class that loads and manages your bundle configuration
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html}
 */
class MyOwnExtension extends Extension
{
    /**
     * {@inheritDoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('services.yml');

        $container->setAlias('my_own.service', $config['service']);
        $container->setAlias('my_own.user_listener', $config['user_listener']);
    }
}

最后，在其余代码中，您必须在代码中使用别名服务 my_own.service 和 my_own.user_listener：

// In one of your controller:
$this->container->get('my_own.service');
/* or directly */ $this->get('my_own.service'); // if your controller is a child of the framework bundle class `Controller`.