How to split validation yaml files in Symfony 2.5?

Symfony 2.5 changed the way validation files were loaded. Here is how to do it now (using the Finder component to dynamically load):

Create a compiler pass:

namespace MyBundle\DependencyInjection\Compiler;

use Symfony\Component\Finder\Finder;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\Config\Resource\DirectoryResource;

class ValidatorPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        $validatorBuilder = $container->getDefinition('validator.builder');
        $validatorFiles = array();
        $finder = new Finder();

        foreach ($finder->files()->in(__DIR__ . '/../../Resources/config/validation') as $file) {
            $validatorFiles[] = $file->getRealPath();
        }

        $validatorBuilder->addMethodCall('addYamlMappings', array($validatorFiles));

        // add resources to the container to refresh cache after updating a file
        $container->addResource(new DirectoryResource(__DIR__ . '/../../Resources/config/validation'));
    }
}

Then, add this compiler pass in your Bundle:

namespace MyBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use MyBundle\DependencyInjection\Compiler\ValidatorPass;

class MyBundle extends Bundle
{
    // . . . .

    public function build(ContainerBuilder $container)
    {
        parent::build($container);

        $container->addCompilerPass(new ValidatorPass());
    }

    // . . . .      
}

You should use ValidatorBuilder#addYamlMappings/ValidatorBuilder#addYamlMapping:

$builderDefinition = $container->getDefinition('validator.builder');
$builderDefinition->addMethodCall('addYamlMappings', array(
    array(
        __DIR__.'/../Resources/config/validation/site_user.yml';
        __DIR__.'/../Resources/config/validation/human_resource.yml';
        __DIR__.'/../Resources/config/validation/tag.yml';
        __DIR__.'/../Resources/config/validation/company.yml';
        __DIR__.'/../Resources/config/validation/programming_language.yml';
        __DIR__.'/../Resources/config/validation/technology.yml';
        __DIR__.'/../Resources/config/validation/language.yml';
        __DIR__.'/../Resources/config/validation/management.yml';
        __DIR__.'/../Resources/config/validation/calendar_entry.yml'
    )
));

This works out-of-the box with Symfony 2.7.

https://github.com/symfony/symfony/pull/13855