diff --git a/app/models/board.rb b/app/models/board.rb
index 35a7a72d1..67d59e599 100644
--- a/app/models/board.rb
+++ b/app/models/board.rb
@@ -18,7 +18,7 @@
 class Board < ActiveRecord::Base
   include Redmine::SafeAttributes
   belongs_to :project,:touch => true
-  belongs_to :course
+  belongs_to :course,:touch=>true
   has_many :topics, :class_name => 'Message', :conditions => "#{Message.table_name}.parent_id IS NULL", :order => "#{Message.table_name}.created_on DESC"
   has_many :messages, :dependent => :destroy, :order => "#{Message.table_name}.created_on DESC"
   belongs_to :last_message, :class_name => 'Message', :foreign_key => :last_message_id
diff --git a/app/models/comment.rb b/app/models/comment.rb
index 9de25c50d..0830d8fdd 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -31,7 +31,7 @@ class Comment < ActiveRecord::Base
                 :title=>Proc.new {|o| "RE: #{o.commented.title}" },
                 :url => Proc.new {|o| {:controller => 'news', :action => 'show', :id => o.commented.id} }
 
-  belongs_to :commented, :polymorphic => true, :counter_cache => true
+  belongs_to :commented, :polymorphic => true, :counter_cache => true,:touch => true
   belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'
   validates_presence_of :commented, :author, :comments
   safe_attributes 'comments'
diff --git a/app/models/exercise.rb b/app/models/exercise.rb
index e4295971e..d23e8f115 100644
--- a/app/models/exercise.rb
+++ b/app/models/exercise.rb
@@ -2,6 +2,7 @@ class Exercise < ActiveRecord::Base
   #exercise_status: 1,新建；2，发布；3，关闭
   include Redmine::SafeAttributes
   belongs_to :user
+  belongs_to :course ,:touch => true
   has_many :exercise_questions, :dependent => :destroy,:order => "#{ExerciseQuestion.table_name}.question_number"
   has_many :exercise_users, :dependent => :destroy
   has_many :users, :through => :exercise_users #该测试被哪些用户提交答案过
diff --git a/app/models/journals_for_message.rb b/app/models/journals_for_message.rb
index 20b3c60bf..ec6390408 100644
--- a/app/models/journals_for_message.rb
+++ b/app/models/journals_for_message.rb
@@ -24,7 +24,7 @@ class JournalsForMessage < ActiveRecord::Base
              :conditions => "#{self.table_name}.jour_type = 'Project' ",:touch => true
 
   belongs_to :course,
-             :foreign_key => 'jour_id'
+             :foreign_key => 'jour_id',:touch=>true
 
 
   belongs_to :jour, :polymorphic => true
diff --git a/app/models/news.rb b/app/models/news.rb
index aa5d6df1f..53581a536 100644
--- a/app/models/news.rb
+++ b/app/models/news.rb
@@ -21,7 +21,7 @@ class News < ActiveRecord::Base
   include ApplicationHelper
   has_many_kindeditor_assets :assets, :dependent => :destroy
   #added by nwb
-  belongs_to :course
+  belongs_to :course,:touch => true
   belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'
   has_many :comments, :as => :commented, :dependent => :destroy, :order => "created_on"
   # fq