Symfony 3 - 你请求一个不存在的服务让我发疯

Question

所以，这不是我第一次创建服务，但我无法解决错误

您请求了一个不存在的服务“global_settings”。

我为确保正确设置服务而采取的步骤：

我的AppBundleExtension.php

namespace AppBundle\DependencyInjection;

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

class AppBundleExtension extends Extension
{
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('settings.xml');
    }
}

我的settings.xml

<?xml version="1.0" encoding="UTF-8" ?>
<container
        xmlns="http://symfony.com/schema/dic/services"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
    <services>
        <service id="global_settings" class="AppBundle\Services\GlobalSettings">
            <call method="setEntityManager">
                <argument type="service" id="doctrine.orm.default_entity_manager" />
            </call>
        </service>
    </services>
</container>

我的GlobalSettings 服务

namespace AppBundle\Services;
use Doctrine\ORM\EntityManager;
use Doctrine\ORM\EntityRepository;
    class GlobalSettings
    {

        /**
         * @var EntityManager
         */
        protected $em;
        /**
         * @var EntityRepository
         */
        protected $repo;

        public function setEntityManager(EntityManager $em) {
            $this->em = $em;
            $this->repo = null;
        }

        /**
         * @return array with name => value
         */
        public function all() {
            return $this->$this->getRepo()->findAll();
        }


        /**
         * @param string $name Name of the setting.
         * @return string|null Value of the setting.
         * @throws \RuntimeException If the setting is not defined.
         */
        public function get($name) {
            $setting = $this->$this->getRepo()->findOneBy(array(
                'name' => $name,
            ));
            if ($setting === null) {
                throw $this->createNotFoundException($name);
            }
            return $setting->getValue();
        }
        /**
         * @param string $name Name of the setting to update.
         * @param string|null $value New value for the setting.
         * @throws \RuntimeException If the setting is not defined.
         */
        public function set($name, $value) {
            $setting = $this->$this->getRepo()->findOneBy(array(
                'name' => $name,
            ));
            if ($setting === null) {
                throw $this->createNotFoundException($name);
            }
            $setting->setValue($value);
            $this->em->flush($setting);
        }
        /**
         * @return EntityRepository
         */
        protected function getRepo() {
            if ($this->repo === null) {
                $this->repo = $this->em->getRepository('AppBundle:Settings');
            }
            return $this->repo;
        }

        /**
         * @param string $name Name of the setting.
         * @return \RuntimeException
         */
        protected function createNotFoundException($name) {
            return new \RuntimeException(sprintf('Setting "%s" couldn\'t be found.', $name));
        }


    }

然后在我的控制器内部，我尝试使用以下代码访问服务

$data = $this->get('global_settings')->get('paypal_email');

我做错了什么？任何帮助将不胜感激，因为我不知道。

Answer 1

你写道：

我为确保正确设置服务而采取的步骤

我的AppBundleExtension.php

还有：

我知道AppBundleExtension 没有加载，我需要怎么做才能加载它？我错过了什么？

所以很明显AppBundleExtension 类没有加载。

根据official documentation你应该删除文件名和类名中的Bundle：

名称等于包名称，将Bundle 后缀替换为Extension（例如，AppBundle 的扩展类将称为AppExtension，AcmeHelloBundle 的扩展类将称为AcmeHelloExtension）。

Answer 2

您可以更新您的 config.yml 文件：

imports: 
      - { resource: "@AppBundle/Resources/config/services.yml" }

Answer 3

我不断收到此错误的原因是我的服务默认设置是public: false

为了解决这个问题，我需要将public 属性设置为true 以供我的服务使用

services:
    # default configuration for services in *this* file
    _defaults:
        # automatically injects dependencies in your services
        autowire: true
        # automatically registers your services as commands, event subscribers, etc.
        autoconfigure: true
        # this means you cannot fetch services directly from the container via $container->get()
        # if you need to do this, you can override this setting on individual services
        public: false

    my_service:
        class: AppBundle\Service\MyService
        public: true