Params not being passed to method in Rails 3.0.3

I have another very puzzling question that has cropped up after my upgrade from Rails 2.3.4 to Rails 3.0.3.

I am calling a 'show' controller method with the following URL:

/verse/10

and I see this in the terminal

Started GET "/verse/10" for 127.0.0.1 at 2011-01-27 16:17:58 -0800

Processing by VersesController#show as HTML

* Searching for verse with ID:

Rendered verses/show.html.erb within layouts/application (76.6ms)

Completed 200 OK in 1006ms (Views: 125.4ms | ActiveRecord: 9.8ms)

The verse show method is very simple:

  def show
    logger.debug("*** Searching for verse with ID: #{params[:id]}")
    @vs = Verse.find(params[:id])
  end

The route is defined as follows:

match '/verse/:id', :to => 'verses#show', :as => 'verse'

The problem: the parameter, ID, which in this case is '10', is not being passed in to the controller method and so a 404 is being thrown because params[:id] is nil.

The output from "rake routes | grep verse" is as follows:

verse /verse/:id(.:format) {:controller=>"verses", :action=>"show"}

I've spent ages on this but feel as though I'm missing something very obvious.

Here is the full rake routes output:

                   login        /login(.:format)                                  {:controller=>"sessions", :action=>"new"}
                  logout        /logout(.:format)                                 {:controller=>"sessions", :action=>"destroy"}
                register        /register(.:format)                               {:controller=>"users", :action=>"create"}
                  signup        /signup(.:format)                                 {:controller=>"users", :action=>"new"}
                activate        /activate/:activation_code(.:format)              {:activation_code=>nil, :controller=>"users", :action=>"activate"}
         forgot_password        /forgot_password(.:format)                        {:controller=>"passwords", :action=>"new"}
         change_password        /change_password/:reset_code(.:format)            {:controller=>"passwords", :action=>"reset"}
        open_id_complete GET    /opensession(.:format)                            {:controller=>"sessions", :action=>"create"}
          open_id_create GET    /opencreate(.:format)                             {:controller=>"users", :action=>"create"}
                   users GET    /users(.:format)                                  {:action=>"index", :controller=>"users"}
                         POST   /users(.:format)                                  {:action=>"create", :controller=>"users"}
                new_user GET    /users/new(.:format)                              {:action=>"new", :controller=>"users"}
               edit_user GET    /users/:id/edit(.:format)                         {:action=>"edit", :controller=>"users"}
                    user GET    /users/:id(.:format)                              {:action=>"show", :controller=>"users"}
                         PUT    /users/:id(.:format)                              {:action=>"update", :controller=>"users"}
                         DELETE /users/:id(.:format)                              {:action=>"destroy", :controller=>"users"}
               passwords GET    /passwords(.:format)                              {:action=>"index", :controller=>"passwords"}
                         POST   /passwords(.:format)                              {:action=>"create", :controller=>"passwords"}
            new_password GET    /passwords/new(.:format)                          {:action=>"new", :controller=>"passwords"}
           edit_password GET    /passwords/:id/edit(.:format)                     {:action=>"edit", :controller=>"passwords"}
                password GET    /passwords/:id(.:format)                          {:action=>"show", :controller=>"passwords"}
                         PUT    /passwords/:id(.:format)                          {:action=>"update", :controller=>"passwords"}
                         DELETE /passwords/:id(.:format)                          {:action=>"destroy", :controller=>"passwords"}
                 session POST   /session(.:format)                                {:action=>开发者_运维知识库;"create", :controller=>"sessions"}
             new_session GET    /session/new(.:format)                            {:action=>"new", :controller=>"sessions"}
            edit_session GET    /session/edit(.:format)                           {:action=>"edit", :controller=>"sessions"}
                         GET    /session(.:format)                                {:action=>"show", :controller=>"sessions"}
                         PUT    /session(.:format)                                {:action=>"update", :controller=>"sessions"}
                         DELETE /session(.:format)                                {:action=>"destroy", :controller=>"sessions"}
                  quests GET    /quests(.:format)                                 {:action=>"index", :controller=>"quests"}
                         POST   /quests(.:format)                                 {:action=>"create", :controller=>"quests"}
               new_quest GET    /quests/new(.:format)                             {:action=>"new", :controller=>"quests"}
              edit_quest GET    /quests/:id/edit(.:format)                        {:action=>"edit", :controller=>"quests"}
                   quest GET    /quests/:id(.:format)                             {:action=>"show", :controller=>"quests"}
                         PUT    /quests/:id(.:format)                             {:action=>"update", :controller=>"quests"}
                         DELETE /quests/:id(.:format)                             {:action=>"destroy", :controller=>"quests"}
                   index        /home(.:format)                                   {:controller=>"verses", :action=>"index"}
            starter_pack        /starter_pack(.:format)                           {:controller=>"verses", :action=>"starter_pack"}
                   *verse        /verse/:id(.:format)                                 {:controller=>"verses", :action=>"show"}*
               tag_cloud        /tag_cloud(.:format)                              {:controller=>"verses", :action=>"tag_cloud"}
          show_user_info        /show_user_info(.:format)                         {:controller=>"admin", :action=>"show_user_info"}
               show_tags        /show_tags(.:format)                              {:controller=>"admin", :action=>"show_tags"}
                 contact        /contact(.:format)                                {:controller=>"info", :action=>"contact"}
                     faq        /faq(.:format)                                    {:controller=>"info", :action=>"faq"}
                tutorial        /tutorial(.:format)                               {:controller=>"info", :action=>"tutorial"}
               volunteer        /volunteer(.:format)                              {:controller=>"info", :action=>"volunteer"}
             leaderboard        /leaderboard(.:format)                            {:controller=>"info", :action=>"leaderboard"}
              stateboard        /stateboard(.:format)                             {:controller=>"info", :action=>"stateboard"}
            countryboard        /countryboard(.:format)                           {:controller=>"info", :action=>"countryboard"}
           referralboard        /referralboard(.:format)                          {:controller=>"info", :action=>"referralboard"}
                    news        /news(.:format)                                   {:controller=>"info", :action=>"news"}
          update_profile        /update_profile(.:format)                         {:controller=>"profile", :action=>"update_profile"}
               referrals        /referrals/:id(.:format)                          {:controller=>"profile", :action=>"referrals"}
             unsubscribe        /unsubscribe/*email(.:format)                     {:controller=>"profile", :action=>"unsubscribe"}
                edit_tag        /edit_tag/:id(.:format)                           {:controller=>"tag", :action=>"edit_tag"}
                  tweets        /tweets(.:format)                                 {:controller=>"tweets", :action=>"index"}
           load_progress        /load_progress/:user(.:format)                    {:controller=>"chart", :action=>"load_progress"}
                    root        /(.:format)                                       {:controller=>"sessions", :action=>"new"}
                    home        /home(.:format)                                   {:controller=>"sessions", :action=>"new"}
                                /:controller(/:action(/:id))(.:format)  

If you have the open_id_authentication plugin installed, that is likely interfering with your routes.