Rails - Mar 2011 - Lost in nested routes

I cannot edit records for nested model.  I have two models...  Document
and Contentitem.   Document has_many Contentitems.

The following link on the Document show page...

<%= link_to ''Edit'', [@document, content], :method =>
:edit %>

Causes the following error...

No route matches "/documents/1/contentitems/9"


This is what I have...   any ideas?

========= routes.rb =============
Dg::Application.routes.draw do

  root :to => "documents#index"

  resources :templategroups do
     resources :templateitems
  end

  resources :documents do
    resources :contentitems
    member do
        put ''insert_into''
        put ''sort''
    end
  end
end

========== contentitems_controller ======
class ContentitemsController < ApplicationController
  before_filter :load_document

  ...

  def edit
     @contentitem = @document.contentitems.find(params[:contentitem])
  end

  ...

  private
    def load_document
        @document = Document.find(params[:document_id])
    end

end

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