Rails routing not working

rails routing

Problem: trying to create a new gyro which belongs to restaurant results in 
  No route matches {:controller=>"gyros", :format=>nil}

Details follow. Most of the code is scaffolded, with some minor tweaks related to nesting gyros inside restaurants.

Restaurants_controller.rb:

  def show
    @restaurant = Restaurant.find(params[:id])
    @gyros = @restaurant.gyros

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @restaurant }
    end
  end

restaurants/show.html.erb:

<p>
	<%= link_to "Add a new gyros", new_restaurant_gyro_path(@restaurant) %>
</p>

gyros_controller.rb:
  def new
    @restaurant = Restaurant.find(params[:restaurant_id])
    @gyro = Gyro.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @gyro }
    end
  end


gyros/new.html.erb:

<h1>New gyro</h1>

<%= render 'form' %>

<%= link_to 'Back', gyros_path %>


routes.rb:

  resources :restaurants do
    resources :gyros
  end


Server log from accessing restaurants/1/gyros/new:


Started GET "/restaurants/1/gyros/new" for 127.0.0.1 at 2011-10-31 22:20:54 -0500
  Processing by GyrosController#new as HTML
  Parameters: {"restaurant_id"=>"1"}
  Restaurant Load (46.8ms)  SELECT "restaurants".* FROM "restaurants" WHERE "restaurants"."id" = ? LIMIT 1  [["id", "1"]]
Rendered gyros/_form.html.erb (7.7ms)
Rendered gyros/new.html.erb within layouts/application (8.6ms)
Completed 500 Internal Server Error in 75ms

ActionView::Template::Error (No route matches {:controller=>"gyros", :format=>nil}):
    1: <%= form_for(@gyro) do |f| %>
    2:   <% if @gyro.errors.any? %>
    3:     <div id="error_explanation">
    4:       <h2><%= pluralize(@gyro.errors.count, "error") %> prohibited this gyro from being saved:</h2>
  app/views/gyros/_form.html.erb:1:in `_app_views_gyros__form_html_erb__4305550367387337329_2162837980'
  app/views/gyros/new.html.erb:3:in `_app_views_gyros_new_html_erb__1082692240219481692_2168489420'
  app/controllers/gyros_controller.rb:30:in `new'

Rake routes result:


               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"}
    restaurant_gyros GET    /restaurants/:restaurant_id/gyros(.:format)          {:action=>"index", :controller=>"gyros"}
                     POST   /restaurants/:restaurant_id/gyros(.:format)          {:action=>"create", :controller=>"gyros"}
 new_restaurant_gyro GET    /restaurants/:restaurant_id/gyros/new(.:format)      {:action=>"new", :controller=>"gyros"}
edit_restaurant_gyro GET    /restaurants/:restaurant_id/gyros/:id/edit(.:format) {:action=>"edit", :controller=>"gyros"}
     restaurant_gyro GET    /restaurants/:restaurant_id/gyros/:id(.:format)      {:action=>"show", :controller=>"gyros"}
                     PUT    /restaurants/:restaurant_id/gyros/:id(.:format)      {:action=>"update", :controller=>"gyros"}
                     DELETE /restaurants/:restaurant_id/gyros/:id(.:format)      {:action=>"destroy", :controller=>"gyros"}
         restaurants GET    /restaurants(.:format)                               {:action=>"index", :controller=>"restaurants"}
                     POST   /restaurants(.:format)                               {:action=>"create", :controller=>"restaurants"}
      new_restaurant GET    /restaurants/new(.:format)                           {:action=>"new", :controller=>"restaurants"}
     edit_restaurant GET    /restaurants/:id/edit(.:format)                      {:action=>"edit", :controller=>"restaurants"}
          restaurant GET    /restaurants/:id(.:format)                           {:action=>"show", :controller=>"restaurants"}
                     PUT    /restaurants/:id(.:format)                           {:action=>"update", :controller=>"restaurants"}
                     DELETE /restaurants/:id(.:format)                           {:action=>"destroy", :controller=>"restaurants"}