shitty helper method for cleaning up multi model's error messages (rails 1.2 blergh)

gistfile1.rb

def tidy_error_messages(model, included_model_names)
  new_errors = ActiveRecord::Errors.new(nil)

  model.errors.each do |key, message|
    new_errors.add(key, message) unless included_model_names.include? key
  end

  # re-jig the errors for the included models
  for included_model_name in included_model_names
    for included_model in model.send(included_model_name)
      included_model.errors.each do |key, message|
        # use a custom error message if the model supports it
        if included_model.respond_to? :create_error_message
          included_model.create_error_message(new_errors, key, message)
        else
          new_errors.add(included_model_name, "#{key} #{message}")
        end
      end
    end

    # wipe out the old errors and chuck the new ones in
    model.errors.clear
    new_errors.each do |key, message|
      model.errors.add key, message
    end
end