fix feed cache error

app/models/bulletin.rb

@@ -10,6 +10,17 @@ class Bulletin
   include Slug
   require 'bulletin_model/cache'
   include BulletinModel::Cache
+  attr_accessor :org_tag_ids
+  def tags=(ids)
+    self.org_tag_ids = self.tag_ids
+    super(ids)
+  end
+  def []=(index,value)
+    if index.to_s=='tags'
+      self.org_tag_ids = self.tag_ids
+    end
+    super(index,value)
+  end
   SubPart.class_eval { include BulletinModel::Cache }
   Page.class_eval { include BulletinModel::Cache }
   before_destroy do

lib/bulletin_model/cache.rb

@@ -10,7 +10,7 @@ module BulletinModel
         AnnsCache.where(parent_id:self.id).destroy
       elsif self.class == Bulletin || (self.class == Page && self.module == "announcement")
         if self.class == Bulletin
-          tmp_tag_ids = (Array(self.tag_ids) + Array(Bulletin.find(self.id).tag_ids)).uniq
+          tmp_tag_ids = (Array(self.tag_ids) + Array(self.org_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