named routes in admin namespace

Hi,

I have a controller Admin::Categories in folder controllers/admin

I have a views/admin/categories/index.html.erb which contains:
<%= link_to 'New category', new_category_path %>

now if my routes.rb contains:
map.resources :categories

Then the generated url does not have /admin/ on the front ie it is:
/categories/new  which does not work as the controller is in /admin

If I do something that seems to be suggested in the comments in
routes.rb ie:
   map.namespace :admin do |admin|
      admin.resources :categories
   end

I get:
undefined local variable or method `new_category_path' for
#<ActionView::Base:0xb6fb5854>

How do I get these fancy named routes to work in the admin namepace?
I could have bunged in :controller=>'categories' , :action=>'new'
However we are told that these named routes are smarter....?

Any help appreciated
George

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