Rails - Apr 2009 - names questions

i have nested resources to configurate, but i don''t know wich logical
name using for models, examples:
####################################
  map.resources :categories do |categories|
    categories.resources :categoryphotos
    categories.resources :subcategories do |subcategories|
      subcategories.resources :subcategoryphotos
    end
  end
##################
or
##################
  map.resources :cats do |cats|
    cats.resources :photocats
    cats.resources :subcats do | subcats |
      subcats.resources :photosubcats
    end
  end
##################
or
##################
  map.resources :cats do |cats|
    cats.resources :photoCats
    cats.resources :subCats do | subCats |
      subCats.resources :photoSubCats
    end
  end
####################################


What is the best solution for obtain a code slim, logical and simple?
name of child elements is writing after o befor the name of parent?
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