Symfony's link_to helper method ignores the third argument

I'm trying to generate environment-independent links in a navigation menu with Symfony routing system. I have the following routes in routing.yml:

# Navigation menu rules
sample:
  class:   sfDoctrineRouteCollection
  options: { model: Sample }

# Default rules (catch all)
homepage:
  url:    /
  param:  { module: sample, action: index }

default_index:
  url:   /:module
  param: { action: index }

default:
  url:   /:module/:action/*

And i开发者_开发知识库n the navigation menu, I have the following calls to the link_to helper method, customized according to the actual section:

<?php
...
if ( $actualSection === 'sample' )
    echo link_to('Sample', 'sample', array('class' => 'actualSection'));
else
    echo link_to('Sample', 'sample');

...
?>

Problem is that link_to is generating links like:

<a href="/sample?class=actualSection">Samples</a>

instead of

<a href="/sample" class="actualSection">Samples</a>

What is the correct way to use the link_to helper method with the routing system in order to generate the latter link?

According to link_to documentation internal URIs should be written in 'module/action' format, so I guess the initial / can be omitted.

Your second argument seems to be incorrect. Either you put the name of a route, prefixed by '@' (like @sample_index or whatever route sfDoctrineCollection generates), either you use the "module/action format" => sample/index.

Try something like this:

echo link_to('Sample', 'sample', array(), array('class' => 'actualSection'));

The first array - options for route, and second - html's attributes