当天截止的测验需要发布截止消息

lib/tasks/exercise_close_to_deadline_warn.rake

@@ -3,6 +3,7 @@
 namespace :exercise_deadline_warn do
   desc "exercise deadline warn"
   task :deadline_warn => :environment do
+    #exercise_status 1 未发布  2 已发布   3已截止
     exercises = Exercise.where("exercise_status = 2 and date_format(end_time,'%Y-%m-%d')= '#{Date.today}'") #截止日期都是当天 23.59分，所以年月日相等的一定是今晚会截止的测验
     exercises.each do |exercise|
         course = exercise.course