From 76210a65dc9c9f2aaf36741af8cad4343a39f320 Mon Sep 17 00:00:00 2001
From: cxt <853663049@qq.com>
Date: Fri, 30 Aug 2019 15:48:12 +0800
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---
 ...0190830064803_add_announcement_to_course_modules.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 db/migrate/20190830064803_add_announcement_to_course_modules.rb

diff --git a/db/migrate/20190830064803_add_announcement_to_course_modules.rb b/db/migrate/20190830064803_add_announcement_to_course_modules.rb
new file mode 100644
index 000000000..5f4d1eeb9
--- /dev/null
+++ b/db/migrate/20190830064803_add_announcement_to_course_modules.rb
@@ -0,0 +1,10 @@
+class AddAnnouncementToCourseModules < ActiveRecord::Migration[5.2]
+  def change
+    Course.all.each do |course|
+      unless course.course_modules.exists?(module_type: "announcement")
+        course.course_modules.where.not(module_type: "activity").update_all("position = position + 1")
+        course.course_modules << CourseModule.new(module_type: "announcement", hidden: 1, module_name: "公告栏", position: 2)
+      end
+    end
+  end
+end