diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index 9df117a..f71e946 100644
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -129,14 +129,12 @@ class AnnouncementsController < ApplicationController
         if anns_cache.count > 1
           anns_cache.destroy
         end
-        AnnsCache.create(parent_id: subpart.id.to_s,locale: I18n.locale.to_s,filter_result: sorted_anns.pluck(:id))
+        AnnsCache.create(parent_id: subpart.id.to_s,locale: I18n.locale.to_s,filter_result: sorted_anns.to_a.to_yaml)
       else
         sorted_anns = sorted_anns.sample(widget_data_count)
       end
     else
-      sorted_ann_ids = anns_cache.first.filter_result
-      sorted_anns = Bulletin.find(sorted_ann_ids)
-      sorted_anns = sorted_ann_ids.map{|v1| sorted_anns.find{|v2| v2.id==v1}}
+      sorted_anns = YAML.load(anns_cache.first.filter_result)
     end
     if (defined? SiteFeed).nil? || is_random
       anns = sorted_anns.map{|v| data_to_human_type(v)}