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Loading service definitions from within a bundle

If you want to load services from your bundle instead of having to define them in app/config/services.yml you need to create a dependency injection extension which is able to load your service definitions. You can find detailed documentation on this topic here: Extensions Documentation.

As an example, we want to create an extension for the AppBundle which is able to load a Resources/config/services.yml config file.

First, we need to create an extension class. The extension class name follows the convention that it is located in the DependencyInjection sub-namespace and that it is named the same as the bundle class, but with Bundle replaced with Extension. So for your AppBundle which is living in src/AppBundle/AppBundle.php we'll create the following extension:

// src/AppBundle/DependencyInjection/AppExtension.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\YamlFileLoader;

class AppExtension extends Extension
    public function load(array $configs, ContainerBuilder $container)
        // create a YamlFileLoader - this could also be a XmlFileLoader if you want to load XML 
        $loader = new YamlFileLoader(
            // looks in src/AppBundle/Resources/config
            new FileLocator(__DIR__ . '/../Resources/config')

        // load services.yml
        // more load() calls as needed...

Next, we create the config file we're trying to load:

# src/AppBundle/Resources/config/services.yml

        class: AppBundle\Custom\Class

The services.yml should now automatically be loaded and register the my_custom_class service on the container.