title: Add Shortcut to Nested Route
body: <p>I'm using nested routes and I want to provide some sort of a shortcut method. (I'm using RoR 3.0)</p>
  
  <p>The routes look like this.</p>
  
  <pre><code>resources :countries do
    resources :regions do
      resources :wineries
    end
  end
  </code></pre>
  
  <p>To access a winery route I want to be able to define a function that removes the need to specify a country and region each time. Like:</p>
  
  <pre><code>def winery_path(winery)
    country_region_winery_path (winery.country, winery.region, winery)
  end
  </code></pre>
  
  <p>Where should I do this? How can I get that to be available whereever url_for is available?</p>