Routing problem :(

route_problem.rb

# rake routes:
customer_zone_order_messages POST   /zakaznicka_zona/orders/:order_id/messages(.:format) {:action=>"create", :controller=>"customer_zone/messages"}

# routes.rb:
scope(:path => 'my_path', :module => :customer_zone, :as => 'customer_zone') do
  resources :orders, :only => :show do    
    resources :messages, :only => :create
  end
end

# Controller app/controllers/customer_zone/messages_controller.rb
module CustomerZone
  class MessagesController < ApplicationController
    before_filter :authenticate_zone_user!
    layout 'customer_zone'

    def create
      ...
      redirect_to customer_zone_order_path(@order)
    end

  end
end

# Form _form.html.erb
<%= form_for(@message, :url => customer_zone_order_messages) do |f| %>

# result
ActionController::RoutingError: No route matches {:action=>"create", :controller=>"customer_zone/messages"}