Timo Mika Gläßer

Ok, sorry my misunderstanding. Did you consider using the option "namespace => :books"? See http://www.slideshare.net/mbleigh/upgrading-to-rails-3 at slide 25.

This is actually not a bug. The object was not yet stored in MongoId or ActiveRecord and after some digging I found that to_param calls persisted? and return ni...

In my app the following routes definition

resources :organizations do
  resources :branches
end

produces

No route matches {:controller=>"branches", :action=>...

I think what is actually wrong in your example is the nesting of

    collection do
      resources :genres
    end

where is should just read

  resources :boo...