symfony 1.4 routing: match routes using URL parameters

Question

I have set up friendly URLs for a few search result pages, using a custom route for each:

friendly_search_resultpage:
  url: /products/my-friendly-alias
  param:
    module: products
    action: search
    querystring: searchattribute
    querystring2: searchattribute2

This works fine, but when doing the search directly (i.e. browsing to /products/search?querystring=search...) I want to set a <link rel="canonical"> containing the matching friendly URL. This will help Google understand the relation and that there isn't duplicate content.

I put my friendly URL route at the top of routes.yml and hoped for a magic match, but URL parameters aren't recognised in the checking done by symfony. I have dug into sfRoute, with no luck. Is it possible?

Answer 1

I ended up writing a custom routing class to use for these routes, which is executed when url_for() is called. Here is the code:

<?php
class mySearchFriendlyRoute extends sfRoute
{
  public function matchesParameters($params, $context = array())
  {
    // I can't find symfony sorting parameters into order, so I do
    // (so that foo=x&bar=y is treated the same as bar=y&foo=x)
    ksort($params);
    $mine = $this->defaults;
    ksort($mine);
    if ($params == $mine) {
      return true;
    }
    return false;
  }
}

To use, add class: mySearchFriendlyRoute to the routes.yml entry.