Fix mongoid deeply nested polimorphic

Got the commit from github. The roles and sub_roles save.

app/controllers/admin/roles_controller.rb

@@ -26,12 +26,14 @@ class Admin::RolesController < ApplicationController
   end
   
   def create
+    puts params.to_yaml
     @attribute = Role.new(params[:role])
     @attribute.save
     redirect_to :action => :index
   end
   
   def update
+    puts params.to_yaml
     @attribute = Role.find(params[:id])
     @attribute.update_attributes(params[:role])
     respond_to do |format|