在新建开放课堂的时候，将实践课程的“课程须知”写入课堂公告栏

app/controllers/courses_controller.rb

@@ -158,6 +158,8 @@ class CoursesController < ApplicationController
             @course.subject.subject_members.where.not(user_id: current_user.id).each do |s_member|
               CourseMember.create!(course_id: @course.id, user_id: s_member.user_id, role: 2)
             end
+
+            Inform.create(container: @course, description: @subject.learning_notes)
           end
 
           course_module_types = params[:course_module_types]