Add sub_menu in r_tags

app/controllers/admin/page_parts_controller.rb

@@ -25,7 +25,7 @@ class Admin::PagePartsController < ApplicationController
     @module_apps = ModuleApp.all(:conditions => {:enable_frontend => true})
     @module_app = @part.module_app ? @part.module_app : @module_apps[0]
     @r_tag = @part.public_r_tag.blank? ? LIST[:public_r_tags][0] : @part.public_r_tag
-    @tag_objects = @r_tag.classify.constantize.all
+    @tag_objects = @r_tag.classify.constantize.all rescue nil
       case @module_app.key
         when 'bulletin'
           @categories =  BulletinCategory.all
@@ -74,5 +74,13 @@ class Admin::PagePartsController < ApplicationController
       format.js  {}
     end
   end
+
+  def reload_r_tag_options
+    @r_tag = (ModuleApp.find(params[:id]) rescue nil) || params[:id]
+    @tag_objects = @r_tag.classify.constantize.all rescue nil
+    respond_to do |format|
+      format.js  {}
+    end
+  end
   
 end