How to dynamically add a route to a dedicated resource in Rails3?

I'm trying to summarize some of my code right now. While everything went well, I wrote some mixes that I can dynamically add to controllers or models so that everything is done obeying DRY.

But with my Searchform-Helper, I got into a corner in which, right now, I'm a little ignorant.

I have a mixin 'SearchIndexController' that adds the methods needed to search for data in a searchindex table.

After enabling mixin, I can initialize the search actions in the appropriate controller by calling this method:

def init_searchaction(object, name=nil)
  singular = object.to_s.classify
  plural   = singular.pluralize
  name = "search_#{singular}".to_sym if name.nil?

  unless self.respond_to?(name)
    define_method(name) do
      # init
      success=false

      #TODO 
      # >>> DRAW NEW ROUTE TO THIS ACTION <<<

      # evaluate searchform input for Searchindex-Call
      needle = params[:query]

      success, x, notice = execute_search("#{singular}", needle)
      # send selected/filtered data to page
      respond_to do |format|
        format.js {
          render :update do |page|
            page.call "sidx_updateSearchResultContentAtIdTag", "##{plural.downcase} tbody", "#{render x}" if success
            page.call "sidx_updateNotice", success, "#{notice}"
            page.call "sidx_stopSpinner"
          end
        }
      end
    end
  else
    logger.warn("#{__FILE__}:#{__LINE__}:#{self.to_s}: search-action for '#{self.class.name}' can not be created, it already exists!")
  end
end

, , User-Controller. Userform . , , , ... . :

init_searchaction :user
init_searchaction :department
init_searchaction :client, :find_clients

,

search_user
search_department
find_clients

, , . . "init_searchaction", mixin .

... mixins init_searchaction? , #TODO . , ... , , .

- , ? , !