Sample Object Route Extension

config.yml

services:
    JobRoute.twig.extension:
        class: Me\MyBundle\Extension\JobRouteExtension
        arguments: [@router]
        tags:
            - { name: twig.extension }

JobRouteExtension.php

<?php

namespace Me\MyBundle\Extension;
use Me\MyBundle\Entity\Job;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

class JobRouteExtension extends \Twig_Extension
{
    private $generator;
    
    public function __construct(UrlGeneratorInterface $generator)
    {
        $this->generator = $generator;
    }
    
    public function getFunctions() {
        return array(
            'job_url'  => new \Twig_Filter_Method($this, 'job_url'),
        );
    }

    public function job_url(Job $job)
    {
        $name = 'job_show';
        $parameters = array(
            'company' => $job->getCompanySlug(),
            'location' => $job->getLocationSlug(),
            'id' => $job->getId(),
            'position' => $job->getPositionSlug(),
        )
        return $this->generator->generate($name, $parameters, true);
    }
    
    public function getName()
    {
        return 'job_route';
    }
}