fix not show problem

lib/announcement/engine.rb

@@ -37,7 +37,7 @@ module Announcement
         data_item[key_item2] = [value2_item1,value2_item2]
         require File.expand_path('../../../app/models/anns_cache', __FILE__)
         if defined? AnnsCache
-          AnnsCache.all.destroy
+          AnnsCache.destroy_all
         end
       rescue  => e
         puts ['error in announcement',e]