diff --git a/app/models/bulletin.rb b/app/models/bulletin.rb
index 72d98a8..44e8e0c 100644
--- a/app/models/bulletin.rb
+++ b/app/models/bulletin.rb
@@ -10,14 +10,28 @@ class Bulletin
   include Slug
   require 'bulletin_model/cache'
   include BulletinModel::Cache
-  attr_accessor :org_tag_ids
+  attr_accessor :org_tag_ids,:org_category_id
   def tags=(ids)
     self.org_tag_ids = self.tag_ids
     super(ids)
   end
+  def category=(cat)
+    self.org_category_id = self.category_id
+    super(cat)
+  end
+  def tag_ids=(ids)
+    self.org_tag_ids = self.tag_ids
+    super(ids)
+  end
+  def category_id=(cat_id)
+    self.org_category_id = self.category_id
+    super(cat_id)
+  end
   def []=(index,value)
-    if index.to_s=='tags'
+    if index.to_s=='tags' || index.to_s=='tag_ids'
       self.org_tag_ids = self.tag_ids
+    elsif index.to_s=='category' || index.to_s=='category_id'
+      self.org_category_id = self.category_id
     end
     super(index,value)
   end
diff --git a/lib/bulletin_model/cache.rb b/lib/bulletin_model/cache.rb
index 6317e96..4c49880 100644
--- a/lib/bulletin_model/cache.rb
+++ b/lib/bulletin_model/cache.rb
@@ -12,8 +12,9 @@ module BulletinModel
       elsif self.class == Bulletin || (self.class == Page && self.module == "announcement")
         if self.class == Bulletin
           tmp_tag_ids = (Array(self.tag_ids) + Array(self.org_tag_ids)).uniq
+          tmp_cat_ids = (Array(self.category_id) + Array(self.org_category_id)).uniq
           Thread.new do
-            BulletinFeedCache.where(:uid.in => BulletinFeed.where(:tag_ids.in => tmp_tag_ids.collect{|v| v.to_s}).pluck(:uid)).each do |cache|
+            BulletinFeedCache.where(:uid.in => BulletinFeed.any_of([{:tag_ids.in => tmp_tag_ids.collect{|v| v.to_s}},{:category_ids.in => tmp_cat_ids.collect{|v| v.to_s}}]).pluck(:uid)).each do |cache|
               cache.regenerate
             end
           end