添加记录统计时间

app/controllers/courses_controller.rb

@@ -1514,7 +1514,7 @@ class CoursesController < ApplicationController
   # 学生角度观看课堂视频的记录
   def own_watch_histories
     @current_user = current_user
-    
+
     @videos = CourseVideo.joins("
       JOIN videos ON course_videos.course_id = #{@course.id} AND videos.id = course_videos.video_id
       JOIN watch_course_videos ON course_videos.id = watch_course_videos.course_video_id AND watch_course_videos.user_id = #{current_user.id}
@@ -1548,7 +1548,8 @@ class CoursesController < ApplicationController
     render json: {
       total_duration: @total_duration,
       freq: @frequencies,
-      people_num: @people_num
+      people_num: @people_num,
+      begin_at: '2020-03-13 24:00'
     }
   end