diff --git a/lib/tasks/public_course_sync.rake b/lib/tasks/public_course_sync.rake
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+++ b/lib/tasks/public_course_sync.rake
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+#coding=utf-8
+# 执行示例  bundle exec rake public_course:student args=149,2903
+# args 第一个参数是subject_id，第二个参数是课程course_id
+# 第一期时间：2018-12-16 至2019-03-31
+# 第二期时间：2019-04-07 至2019-07-28
+#
+# 这次学习很有收获，感谢老师提供这么好的资源和细心的服务🎉🎉🎉
+#
+
+desc "同步精品课数据"
+namespace :public_classes do
+  if ENV['args']
+    subject_id = ENV['args'].split(",")[0] # 对应课程的id
+    course_id = ENV['args'].split(",")[1] # 对应课堂的id
+    start_time = ENV['args'].split(",")[2] # 表示课程模块
+    end_time = ENV['args'].split(",")[3] # 表示课程模块
+    limit = ENV['args'].split(",")[4] # 限制导入的数量
+    type = ENV['args'].split(",")[5] # 表示课程模块
+  end
+
+
+  task :student => :environment do
+    puts "subject_id is #{subject_id}"
+    puts "course_id is #{course_id}"
+
+    user_ids = Myshixun.find_by_sql("select distinct(user_id) from myshixuns where created_at between #{start_time} and #{end_time} and shixun_id in (select shixun_id from stage_shixuns
+                                     where stage_id in (select id from stages where subject_id=#{subject_id})) limit #{limit}").map(&:user_id)
+    puts user_ids
+    if user_ids.present?
+      user_ids.each do |user_id|
+        puts user_id
+        begin
+          CourseMember.create!(course_id: course_id, user_id: user_id, role: 4)
+        rescue Exception => e
+          Rails.logger(e.message)
+        end
+      end
+    end
+  end
+
+  task :test_user => :environment do
+    users = User.where(is_test: true)
+    users.limit(limit).find_each do |user|
+      puts user.id
+      CourseMember.create!(course_id: course_id, user_id: user.id, role: 4)
+    end
+  end
+
+
+  # 更新某个课程的某类时间
+  # 执行示例  RAILS_ENV=production bundle exec rake public_course:time args=-1,2932,1,1
+  task :time => :environment do
+    # course_id = ENV['args'].split(",")[0] # 对应课堂的id
+    # type = ENV['args'].split(",")[1]
+
+    course = Course.find(course_id)
+
+    case type.to_i
+    when 1
+      # 讨论区
+      messages = Message.where(board_id: course.boards)
+      messages.each do |message|
+        created_on = random_time start_time, end_time
+        puts created_on
+        message.update_columns(created_on: created_on, updated_on: created_on)
+        MessageDetail.where(message_id: message.id).each do |detail|
+          rand_created_on = random_time start_time, end_time
+          detail.update_columns(created_at: rand_created_on, updated_at: rand_created_on)
+        end
+      end
+    when 2
+      # 作业
+      course.homework_commons.each do |homework|
+        created_at = random_time(start_time, end_time)
+        publish_time = random_larger_time created_at, start_time, end_time
+        end_time = random_larger_time publish_time, start_time, end_time
+        updated_at = end_time
+
+        homework.update_columns(publish_time: publish_time, end_time: end_time, created_at: created_at, updated_at: updated_at)
+        homework.homework_detail_manual.update_columns(comment_status: 6, created_at: created_at, updated_at: updated_at)
+
+        homework.student_works.where("work_status !=0 and update_time > '#{end_time}'").update_all(update_time: end_time)
+      end
+    when 3
+      # 试卷
+      course.exercises.each do |exercise|
+        created_at = random_time start_time, end_time
+        publish_time = random_larger_time created_at, start_time, end_time
+        end_time = random_larger_time publish_time, start_time, end_time
+        updated_at = end_time
+
+        exercise.update_columns(publish_time: publish_time, end_time: end_time, created_at: created_at, updated_at: updated_at, exercise_status: 3)
+      end
+    when 4
+      # 资源
+      course.attachments.each do |atta|
+        created_on = random_time start_time, end_time
+
+        atta.update_columns(is_publish: 1, created_on: created_on, publish_time: created_on)
+      end
+    end
+
+  end
+
+  task :create_homework_work => :environment do
+    course = Course.find(course_id)
+    course.practice_homeworks.each do |homework|
+      if homework.student_works.count == 0
+        str = ""
+        CourseMember.students(course).each do |student|
+          str += "," if str != ""
+          str += "(#{homework.id},#{student.user_id}, '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')"
+        end
+        if str != ""
+          sql = "insert into student_works (homework_common_id, user_id, created_at, updated_at) values" + str
+          ActiveRecord::Base.connection.execute sql
+        end
+      end
+    end
+  end
+
+  def min_swith(time)
+    puts time
+    return time < 9 ? "0#{time}" : time
+  end
+
+  def random_time(start_time, end_time)
+    hour = (6..23).to_a.sample(1).first
+    min = rand(60)
+    sec = rand(60)
+
+    start_time = Date.parse(start_time)
+    end_time = Date.parse(end_time)
+    date = (start_time..end_time).to_a.sample(1).first
+
+    time = "#{date} #{min_swith(hour)}:#{min_swith(min)}:#{min_swith(sec)}"
+
+    puts time
+    time
+  end
+
+  def random_larger_time(time, start_time, end_time)
+    large_time = random_time(start_time, end_time)
+    while large_time <= time
+      large_time = random_time(start_time, end_time)
+    end
+    large_time
+  end
+end
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