fix 视频总览人数

app/controllers/courses_controller.rb

@@ -1503,11 +1503,10 @@ class CoursesController < ApplicationController
     @videos = CourseVideo.joins("
       JOIN videos ON course_videos.course_id = #{@course.id} AND videos.id = course_videos.video_id
       LEFT JOIN (
-        SELECT watch_course_videos.course_video_id, SUM(watch_course_videos.total_duration) AS time, COUNT(watch_video_histories.watch_course_video_id) AS num
+        SELECT watch_course_videos.course_video_id, SUM(watch_course_videos.total_duration) AS time, COUNT(watch_course_videos.course_video_id) AS num
         FROM watch_course_videos
         JOIN course_videos ON course_videos.id = watch_course_videos.course_video_id AND watch_course_videos.end_at IS NOT NULL
         JOIN course_members ON course_members.user_id = watch_course_videos.user_id AND course_members.course_id = #{@course.id} AND role = 4
-        JOIN watch_video_histories ON watch_course_videos.id = watch_video_histories.watch_course_video_id AND watch_video_histories.end_at IS NOT NULL
         WHERE course_videos.course_id = #{@course.id}
         GROUP BY watch_course_videos.course_video_id
       ) AS hisotries ON hisotries.course_video_id = course_videos.id").select("course_videos.id")