Updating rails 2 routing to rails 3

Hi I'm stuck with a little bit of rails routing,

How should this look in rails 3 routing?:

map.resources :books开发者_Go百科 do |book|  
    book.resources :comments, :only => :create  
end  

---

resources :books do
  resources :comments, :only => :create
end

will do it. More infos about Rails 3 routing at Ruby on Rails Guides: Rails Routing from the Outside In