fix 课堂视频创建

app/services/create_watch_video_service.rb

@@ -51,11 +51,10 @@ class CreateWatchVideoService < ApplicationService
             d.start_at = current_time
             d.duration = params[:duration]
           end
-          
-          watch_video_history = build_video_log(current_time, course_video.video_id, watch_course_video.id)
-          watch_video_history.save!
 
           watch_course_video.save! unless watch_course_video.persisted?
+          watch_video_history = build_video_log(current_time, course_video.video_id, watch_course_video.id)
+          watch_video_history.save!
         else
           # 非课堂视频
           video = Video.find(params[:video_id])