no.rb

resources :users, only: [:show] do
  # even if a client knows address id #55, it also neeeds to know which
  # user that belongs to.
  resources :addresses, only: [:index, :create, :show, :update]
end

yes.rb

resources :users, only: [:show] do
  resources :addresses, only: [:index, :create], controller: :user_addresses
end

resources :addresses, only: [:show, :update]