Symfony2: use object to set route parameters

UrlGenerator.php

<?php

namespace Acme\BaseBundle\Routing\Generator;

use Symfony\Component\Routing\Generator\UrlGenerator as BaseUrlGenerator;
use Doctrine\Common\Util\Inflector;

/**
 * UrlGenerator generates URL based on a set of routes.
 *
 * @api
 */
class UrlGenerator extends BaseUrlGenerator
{
    protected function doGenerate($variables, $defaults, $requirements, $tokens, $parameters, $name, $referenceType, $hostTokens)
    {
        if (is_object($parameters)) {
            $object = $parameters;
            $parameters = array();
        }

        if (isset($parameters['object']) && is_object($parameters['object'])) {
            $object = $parameters['object'];
        }

        if (isset($object)) {
            $parameters = array_replace($this->context->getParameters(), $parameters);
            $tparams = array_replace($defaults, $parameters);
            $requiredParameters = array_diff_key(array_flip($variables), $tparams);

            $parameters += $this->getParametersFromObject(array_flip($requiredParameters), $object);

            unset($parameters['object']);
        }

        return parent::doGenerate($variables, $defaults, $requirements, $tokens, $parameters, $name, $referenceType, $hostTokens);
    }

    protected function getParametersFromObject($keys, $object)
    {
        $parameters = array();

        foreach ($keys as $key) {
            $relation = $object;

            $method = 'get' . Inflector::classify($key);

            if (method_exists($relation, $method)) {
                $relation = $relation->$method();
            } else {
                $segments = explode('_', $key);

                if (count($segments) > 1) {
                    foreach ($segments as $segment) {
                        $method = 'get' . Inflector::classify($segment);

                        if (method_exists($relation, $method)) {
                            $relation = $relation->$method();
                        } else {
                            $relation = $object;
                            break;
                        }
                    }
                }
            }

            if ($object !== $relation) {
                $parameters[$key] = $relation;
            }
        }

        return $parameters;
    }
}