This is more tricky than it should be because url_for, asset_path, etc. all rely on different mechanisms.

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Anyway, you can use the attached trait like this:

class ExampleController < ApplicationController
  does 'host_enforcement', :for => 'some_action'
end

Short explanation:

• asset_host is used for links to stylesheets and javascripts

• asset_host belongs to ActionController::Base -- changes are persistent and will not be reset after a request

• rewrite_options is used by the ..._path methods in the views
  ^
  module HostEnforcementTrait

  Include this method in a module because we cannot yield out of define_method

  module InstanceMethods
  private

   # Force URLs for JavaScript and Stylesheet links
   def assets_have_urls
     old_asset_host = asset_host
     self.asset_host = HOST
     yield
   ensure
     self.asset_host = old_asset_host
   end
  

  end

  as_trait do |*args|
  include HostEnforcementTrait::InstanceMethods

   options = args.first || {}
   methods = options[:for]
  
   around_filter :assets_have_urls, :only => methods
  
   private
  
   # Force URLs for link_to etc
   define_method :rewrite_options do |*args_options|
     options = args_options.first || {}
     enforce = methods.nil? || Array(methods).collect(&:to_s).include?(action_name)
     super(enforce ? options.merge(:only_path => false) : options)
   end
  

  end

  end

You need modularity Show archive.org snapshot for traits.