How to define default date values in Symfony2 routes?

Question

If I want to create a route, where the year, month and date are variables, how can I define that if these variables are empty, the current date shall be taken?

E.g.

Answer 1

Dynamic Container Parameters

You can set container parameters dynamically in your bundle's extension located Acme\BlogBundle\DependencyInjection\AcmeBlogExtension afterwards you can use those parameters in your routes like %parameter%.

Extension

namespace Acme\BlogBundle\DependencyInjection;

use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class AcmeBlogExtension extends Extension
{
    public function load(array $configs, ContainerBuilder $container)
    {
        $container->setParameter(
            'current_year',
            date("Y")
        );

        $container->setParameter(
            'current_month',
            date("m")
        );

        $container->setParameter(
            'current_day',
            date("d")
        );
    }
}

Routing Configuration

blog:
    path:      /blog/{year}/{month}/{day}
    defaults:  { _controller: AcmeBlogBundle:Blog:index, year: %current_year%, month: %current_month%, day: %current_day% }

Static Parameters

If you only need configurable static parameters you can just add them to your config.yml.

parameters:
    static_parameter: "whatever"

... then again access them in your routing like %static_parameter%.