fix error

lib/bulletin_model/cache.rb

@@ -10,7 +10,8 @@ module BulletinModel
         AnnsCache.where(parent_id:self.id).destroy
       elsif self.class == Bulletin || (self.class == Page && self.module == "announcement")
         if self.class == Bulletin
-          BulletinFeedCache.where(:uid.in => BulletinFeed.where(:tag_ids.in => Array(self.tag_ids).collect{|v| v.to_s}).pluck(:uid)).destroy
+          tmp_tag_ids = (Array(self.tag_ids) + Array(Bulletin.find(self.id).tag_ids)).uniq
+          BulletinFeedCache.where(:uid.in => BulletinFeed.where(:tag_ids.in => tmp_tag_ids.collect{|v| v.to_s}).pluck(:uid)).destroy
         end
         AnnsCache.all.destroy
       end