Symfony2. There is no extension able to load the configuration. Custom configuration block

Question

I am start my first project in symfony 2. I use Symfony 2.6.6

My AppKernel.php

<?php

use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;

class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = array(
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
            new Symfony\Bundle\TwigBundle\TwigBundle(),
            new Symfony\Bundle\MonologBundle\MonologBundle(),
            new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
            new Symfony\Bundle\AsseticBundle\AsseticBundle(),
            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
            new FOS\UserBundle\FOSUserBundle(),
            new AppBundle\AppBundle(),
        );

        if (in_array($this->getEnvironment(), array('dev', 'test'))) {
            $bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
            $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
            $bundles[] = new Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle();
            $bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
        }

        return $bundles;
    }

    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $loader->load($this->getRootDir().'/config/config_'.$this->getEnvironment().'.yml');
    }
}

And my src/AppBundle/DependencyInjection\AppExtension.php

<?php
namespace AppBundle\DependencyInjection;

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

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

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

    }
}

My configuration class src/AppBundle/DependencyInjection\Configuration.php

<?php

namespace AppBundle\DependencyInjection;

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

class Configuration implements ConfigurationInterface
{
    /**
     * Generates the configuration tree.
     *
     * @return TreeBuilder
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('karmed');
        $rootNode->children()->scalarNode('var')->end();

        return $treeBuilder;
    }
}

And part of app/config/config.yml

karmed:
  var: off

I don't understand why i have this message when i called app/console?

  [Symfony\Component\Config\Exception\FileLoaderLoadException]    There is no extension able to load the configuration for "karmed" (in /home/vstas/data/work/karmed/app/config/config.yml). Looked for namespace "karmed", found "framework", "security", "twig", "monolog", "swiftmailer", "assetic", "doctrine", "sensio_framework_extra", "fos_user", "app", "debug", "web_profiler", "sensio_distribution" in /home/vstas/data/work/karmed/app/config/config.yml (which is being imported from "/home/vstas/data/work/karmed/app/config/config_dev.yml").

I try remove all files from directory app/cache

I think the problem is configuration loading order, because when i try to change AppExtension to

.....
class AppExtension extends Extension
{
    public function load(array $configs, ContainerBuilder $container)
    {
        print "exit";
        exit();
        $configuration = new Configuration();
.....

Nothing changes. But when i remove from config.yml my part of variables i can see my debug message.

Wouter J Wouter J · Accepted Answer · 2015-04-30T20:53:14

It's not that rootnode name that's used for the configuration, but the DI alias of the extension. As it's the AppExtension, it's alias is app. Configure it using app: instead.

However, AppBundle's aren't meant to be reused. It shouldn't use custom configuration things. Just use constants (best practice) or service parameters directly (recommended practice).

Symfony2. There is no extension able to load the configuration. Custom configuration block

1 Answers