课堂视频时长统计

app/controllers/courses_controller.rb

@@ -30,7 +30,7 @@ class CoursesController < ApplicationController
                                      :informs, :update_informs, :online_learning, :update_task_position, :tasks_list,
                                     :join_excellent_course, :export_couser_info, :export_member_act_score, :new_informs,
                                     :delete_informs, :change_member_role, :course_groups, :join_course_group, :statistics,
-                                    :work_score, :act_score, :calculate_all_shixun_scores, :move_to_category]
+                                    :work_score, :act_score, :calculate_all_shixun_scores, :move_to_category, :watch_video_histories]
   before_action :user_course_identity, except: [:join_excellent_course, :index, :create, :new, :apply_to_join_course,
                                                 :search_course_list, :get_historical_course_students, :mine, :search_slim, :board_list]
   before_action :teacher_allowed, only: [:update, :destroy, :settings, :search_teacher_candidate,
@@ -114,7 +114,7 @@ class CoursesController < ApplicationController
 
     #sql = "left join videos on videos.id=course_videos.video_id AND (videos.transcoded=1 OR videos.user_id = #{current_user.id})"
     #@videos = paginate videos.joins(sql).includes(video: [user: :user_extension], user: :user_extension)
-    videos = videos.includes(video: [user: :user_extension], user: :user_extension)
+    videos = videos.includes(:watch_course_videos, video: [user: :user_extension],user: :user_extension)
     videos = videos.where(videos: {transcoded: true})
                  .or(videos.where(videos: {user_id: current_user.id}))
                  .or(videos.where(course_videos: {is_link: true}))
@@ -1481,6 +1481,23 @@ class CoursesController < ApplicationController
     end
   end
 
+  def watch_video_histories
+    @videos = CourseVideo.find_by_sql("
+      SELECT course_videos.id, videos.user_id, videos.title, IFNULL(hisotries.time,0) AS time, IFNULL(hisotries.num,0) AS num
+      FROM course_videos
+      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_course_videos.course_video_id) AS num
+				FROM watch_course_videos
+        JOIN course_videos ON course_videos.id = watch_course_videos.course_video_id
+        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
+    ")
+    @count = @videos.count
+    @videos = paginate @videos
+  end
+
   private
 
   # Use callbacks to share common setup or constraints between actions.

app/services/create_watch_video_service.rb

@@ -28,13 +28,16 @@ class CreateWatchVideoService < ApplicationService
 
           watch_course_video = watch_video_history.watch_course_video
 
+          watch_course_video.total_duration = watch_course_video.watch_video_histories.sum(:total_duration)
+          watch_course_video.end_at = current_time
+          watch_course_video.save!
+
           if watch_course_video.present? && !watch_course_video.is_finished && watch_course_video.watch_duration < params[:watch_duration].to_f
             # 更新课程视频的时长及是否看完状态
             watch_course_video.watch_duration = params[:watch_duration]
             if params[:ed].present?
               watch_course_video.is_finished = watch_course_video.watch_video_histories.sum(:total_duration) >= watch_course_video.duration
             end
-            watch_course_video.end_at = current_time
             watch_course_video.save!
           end
         end

app/views/courses/course_videos.json.jbuilder

@@ -10,6 +10,8 @@ json.videos @videos do |video|
     json.user_login user&.login
   else
     json.partial! 'users/videos/video', locals: { video: video.video }
+    json.total_time video.watch_course_videos.sum(:total_duration)
+    json.people_num video.watch_course_videos.count(:user_id)
   end
 end
 

app/views/courses/watch_video_histories.json.jbuilder

@@ -0,0 +1,10 @@
+json.videos do
+  json.array! @videos do |v|
+    json.id v.id
+    json.title v.title
+    json.user_name v.user&.real_name
+    json.people_num v.num
+    json.total_time v.time
+  end
+end
+json.count @count

config/routes.rb

@@ -531,6 +531,7 @@ Rails.application.routes.draw do
         post :inform_up
         post :inform_down
         get :calculate_all_shixun_scores
+        get :watch_video_histories
       end
 
       collection do

db/migrate/20200313104522_add_total_duration_to_watch_course_duration.rb

@@ -0,0 +1,8 @@
+class AddTotalDurationToWatchCourseDuration < ActiveRecord::Migration[5.2]
+  def change
+    add_column :watch_course_videos, :total_duration, :float, default: 0
+    WatchVideoHistory.where("created_at < '2020-03-14 00:00:00'").each do |d|
+      d.watch_course_video.increment!(:total_duration, d.total_duration) if d.watch_course_video.present?
+    end
+  end
+end