chill-bundles/DependencyInjection/ChillCustomFieldsExtension.php

<?php

namespace Chill\CustomFieldsBundle\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 ChillCustomFieldsExtension 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');
        
        //add at least a blank array at 'customizable_entities' options
        //$customizable_entities = (isset($config['customizables_entities']) 
        //        && $config['customizables_entities'] !== FALSE) 
        //        ? $config['customizables_entities'] : array();
        
        $container->setParameter('chill_custom_fields.customizables_entities', 
                $config['customizables_entities']);
    }
}