[英]Symfony2 Dependency Injection with parent services does not work
我正在尝试配置我的Symfony依赖注入,以便我能够使用父服务。 按照我在http://symfony.com/doc/current/components/dependency_injection/parentservices.html中找到的描述,我尝试将以下类设置为第一个测试:
Mailer.php:
namespace testing;
class Mailer
{
private $transport;
public function __construct($transport) {
$this->transport = $transport;
}
public function getTransport() {
return $this->transport;
}
}
MailManager.php:
namespace testing;
abstract class MailManager
{
protected $mailer;
public function setMailer(Mailer $mailer)
{
$this->mailer = $mailer;
}
}
NewsletterManager.php:
namespace testing;
class NewsletterManager extends MailManager {
function getTransport() {
return $this->mailer->getTransport();
}
}
services.yml:
parameters:
mailer.transport: sendmail
services:
mailer:
class: testing\Mailer
arguments: [%mailer.transport%]
mail_manager:
class: testing\MailManager
abstract: true
calls:
- [ setMailer, [ @mailer ] ]
newsletter_manager:
class: testing\NewsletterManager
parent: mail_manager
但是当我尝试使用以下代码运行此配置时:
require_once 'ClassLoading.php';
use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
use Symfony\Component\DependencyInjection\ContainerBuilder;
$container = new ContainerBuilder();
$loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/config'));
$loader->load('services.yml');
$nm = $container->get('newsletter_manager');
echo $nm->getTransport();
我总是得到这个错误:
PHP Fatal error: Call to a member function getTransport() on a non-object in C:\IGMI\workspace\TryingHard\loading\NewsletterManager.php on line 7
有一点似乎是抽象类的setter永远不会被调用,但即使我使抽象类具体化并从实际调用setter的容器中检索它,这也无法解决邮件程序对象的问题没有设定。 所以它告诉我,建立子类关系也存在问题。
任何帮助,将不胜感激!
您应该在尝试访问服务之前编译容器构建器我认为...所以它应该如下所示:
use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
use Symfony\Component\DependencyInjection\ContainerBuilder;
$container = new ContainerBuilder();
$loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/config'));
$loader->load('services.yml');
$container->compile(); //add this line
$nm = $container->get('newsletter_manager');
echo $nm->getTransport();
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