diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 082c8118d..c5ad7a94c 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -984,7 +984,7 @@ class HomeworkCommonsController < ApplicationController
             homework.homework_detail_manual.update_attributes!(comment_status: 1)
 
             if homework.course_act.blank?
-              homework.course_act << CourseActivity.new(user_id: homework.user_id, course_id: homework.course_id)
+              CourseActivity.create!(user_id: homework.user_id, course_id: homework.course_id, course_act: homework)
             end
             # 发消息
             HomeworkCommonPushNotifyJob.perform_later(homework.id, tiding_group_ids)
diff --git a/app/models/course.rb b/app/models/course.rb
index 08e2e36f5..4b997fcb8 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -302,7 +302,7 @@ class Course < ApplicationRecord
 
   #课程动态公共表记录
   def act_as_course_activity
-    self.course_act << CourseActivity.new(user_id: tea_id, course_id: id)
+    CourseActivity.create(user_id: tea_id, course_id: id, course_act: self)
   end
 
   # 当前老师分班下的所有学生
diff --git a/app/models/course_message.rb b/app/models/course_message.rb
index b09613ec4..1bbb7e454 100644
--- a/app/models/course_message.rb
+++ b/app/models/course_message.rb
@@ -30,7 +30,7 @@ class CourseMessage < ApplicationRecord
 
   #课程动态公共表记录
   def act_as_course_activity
-    self.course_act << CourseActivity.new(user_id: course_message_id, course_id: course_id)
+    CourseActivity.create(user_id: course_message_id, course_id: course_id, course_act: self)
   end
 
   def send_deal_tiding deal_status
diff --git a/lib/tasks/homework_publishtime.rake b/lib/tasks/homework_publishtime.rake
index 180afcdc2..b0aae5e58 100644
--- a/lib/tasks/homework_publishtime.rake
+++ b/lib/tasks/homework_publishtime.rake
@@ -45,7 +45,7 @@ namespace :homework_publishtime do
         end
       end
 
-      homework.course_act << CourseActivity.new(user_id: homework.user_id, course_id: homework.course_id) if !homework.course_act.present?
+      CourseActivity.create(user_id: homework.user_id, course_id: homework.course_id, course_act: homework) if !homework.course_act.present?
     end
 
     # 分组设置发布时间的作业