Preview now can be use at both ad_banner and ad_image,however it won't run correctly if user change its ad_banner at ad_image.

config/routes.rb

@@ -24,15 +24,13 @@ Orbit::Application.routes.draw do
       end
     end
 
-    
+
+    match 'ad_banner/:title/preivew' => 'ad_banners#realtime_preview',:as => :realtime_preview_ad_banner,:via => :put
     resources :ad_banners do 
         collection do
           match 'new_ad_image' => 'ad_images#new',:as => :new_ad_image,:via => :get
           match 'new_ad_image' => 'ad_images#create',:as => :create_ad_image,:via => :post
         end
-        member do
-          match 'preivew' => 'ad_banners#realtime_preview',:as => :realtime_preview,:via => :put
-        end
         resources :ad_images ,:except => [:show,:index]
     end
     resources :dashboards