symfony 1.4 custom route using multiple propel models

SearchResultRoute.class.php

<?php

/**
 * The route for matching search result URLs.
 *
 * Available parameters within the route:
 * * product_category  The slug of a product category.
 * * vendor            The slug of a vendor.
 * * search            The search string on a products name.
 *
 * @author Toni Uebernickel <[email protected]>
 */
class SearchResultRoute extends sfRequestRoute
{
  /**
   * @var ProductCategory
   */
  protected $category;

  /**
   * @var Vendor
   */
  protected $vendor;

  /**
   * @var array
   */
  protected $products;

  /**
   * @var string
   */
  protected $productName;

  public function matchesUrl($url, $context = array())
  {
    if (false === $params = parent::matchesUrl($url, $context))
    {
      return false;
    }

    if (null === $this->category = ProductCategoryQuery::create()->findOneBySlug($params['product_category']))
    {
      return false;
    }

    if (null === $this->vendor = VendorQuery::create()->findOneBySlug($params['vendor']))
    {
      return false;
    }

    $this->productName = $params['product_name'];
    $this->products = ProductQuery::create()
      ->filterByProductCategory($this->category)
      ->filterByVendor($this->vendor)
      ->filterByName('%'.trim(str_replace('*', '%', $params['product_name']), '% ').'%', Criteria::LIKE)
      ->find()
    ;

    return $params;
  }

  public function generate($params, $context = array(), $absolute = false)
  {
    // unescape, if escaped
    foreach ($params as $key => $param)
    {
      if (method_exists($param, 'getRawValue'))
      {
        $params[$key] = $param->getRawValue();
      }
    }

    if ($params['product_category'] instanceof ProductCategory)
    {
      $params['product_category'] = $params['product_category']->getSlug();
    }

    if ($params['vendor'] instanceof Vendor)
    {
      $params['vendor'] = $params['vendor']->getSlug();
    }

    $params['product_name'] = (string) $params['product_name'];

    return parent::generate($params, $context, $absolute);
  }

  public function getProductCategory()
  {
    return $this->category;
  }

  public function getVendor()
  {
    return $this->vendor;
  }

  public function getProducts()
  {
    return $this->products;
  }

  public function getProductName()
  {
    return $this->productName;
  }
}