diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 3aacd71fa..4abada488 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -104,7 +104,7 @@ class HomeworkCommonsController < ApplicationController
     @shixun = @homework.shixuns.take if @homework.homework_type == "practice"
 
     student_works = @homework.all_works
-    @all_member_count = student_works.count
+    @all_member_count = student_works.size
     if @homework.publish_time.nil? || @homework.publish_time > Time.now
       @student_works = []
       respond_to do |format|
@@ -135,14 +135,14 @@ class HomeworkCommonsController < ApplicationController
         end
       elsif @user_course_identity < Course::STUDENT
         @student_works = @homework.teacher_works(@member)
-        @all_member_count = @student_works.count
+        @all_member_count = @student_works.size
       elsif @user_course_identity > Course::STUDENT && @homework.work_public
         @student_works = student_works
       else
         @student_works = []
       end
 
-      unless @student_works.size == 0
+      unless @student_works.blank?
         # 教师评阅搜索 0: 未评， 1 已评
         unless params[:teacher_comment].blank?
           student_work_ids = StudentWorksScore.where(student_work_id: @student_works.map(&:id)).pluck(:student_work_id)
@@ -187,12 +187,13 @@ class HomeworkCommonsController < ApplicationController
         # 分页参数
         page = params[:page] || 1
         limit = params[:limit] || 20
-        @student_works = @student_works.page(page).per(limit).includes(:student_works_scores)
+        @student_works = @student_works.page(page).per(limit)
         if @homework.homework_type == "practice"
-          @student_works = @student_works.includes(user: :user_extension, myshixun: :games)
+          @student_works = @student_works.includes(:student_works_scores, user: :user_extension, myshixun: :games)
         else
           @student_works = @student_works.includes(:student_works_scores, :project, user: :user_extension)
         end
+        # @members = @course.students.where(user_id: @student_works.pluck(:user_id)).includes(:course_group)
       end
       respond_to do |format|
         format.json
diff --git a/app/helpers/courses_helper.rb b/app/helpers/courses_helper.rb
index 93b8bfc50..fa51de6b7 100644
--- a/app/helpers/courses_helper.rb
+++ b/app/helpers/courses_helper.rb
@@ -232,7 +232,7 @@ module CoursesHelper
           course.course_groups.includes(:course_members)
         end
     group_info = []
-    if course_groups.count > 0
+    if !course_groups.blank?
       course_groups.each do |group|
         group_info << {course_group_id: group.id, group_group_name: group.name, count: group.course_members_count}
       end
diff --git a/app/helpers/student_works_helper.rb b/app/helpers/student_works_helper.rb
index 682bfbf81..17cdd41a7 100644
--- a/app/helpers/student_works_helper.rb
+++ b/app/helpers/student_works_helper.rb
@@ -54,13 +54,13 @@ module StudentWorksHelper
     objects =
         myshixuns.map do |myshixun|
           # 评测次数
-          evaluate_count = myshixun.games.sum(:evaluate_count)
+          evaluate_count = myshixun.games.pluck(:evaluate_count).sum
           # 获取最大评测次数
           max_evaluate_count = (evaluate_count > max_evaluate_count ? evaluate_count : max_evaluate_count)
           # 通关耗时
-          pass_consume_time = (myshixun.games.where(status: 2).pluck(:cost_time).sum / 60.0)
+          pass_consume_time = (myshixun.total_cost_time / 60.0)
           # 总耗时
-          all_time = (myshixun.games.sum(:cost_time) / 60.0)
+          all_time = (myshixun.games.pluck(:cost_time).sum / 60.0)
           # 通关得分
           user_total_score = myshixun.total_score.to_i
           # 耗时,保留2位小数，
diff --git a/app/models/challenge.rb b/app/models/challenge.rb
index a5d9874ce..5495dd7a3 100644
--- a/app/models/challenge.rb
+++ b/app/models/challenge.rb
@@ -38,7 +38,7 @@ class Challenge < ApplicationRecord
 
   ## 选择题总分
   def choose_score
-    self.challenge_chooses.sum(:score)
+    self.challenge_chooses.pluck(:score).sum
   end
 
   # 关卡总分
diff --git a/app/models/homework_common.rb b/app/models/homework_common.rb
index 9cc2c9a69..9ed80e746 100644
--- a/app/models/homework_common.rb
+++ b/app/models/homework_common.rb
@@ -70,7 +70,7 @@ class HomeworkCommon < ApplicationRecord
       if self.course_second_category.present?
         {category_id: self.course_second_category.try(:id), category_name: self.course_second_category.try(:name)}
       else
-        {category_id: course.shixun_course_modules.first.try(:id), category_name: course.shixun_course_modules.first.try(:module_name)}
+        {category_id: course.shixun_course_modules.take.try(:id), category_name: course.shixun_course_modules.take.try(:module_name)}
       end
     end
   end
diff --git a/app/models/myshixun.rb b/app/models/myshixun.rb
index b5bbdc249..e4573f3dd 100644
--- a/app/models/myshixun.rb
+++ b/app/models/myshixun.rb
@@ -74,12 +74,12 @@ class Myshixun < ApplicationRecord
 
   # 个人实训得分
   def total_score
-    self.games.where("status = 2 and final_score > 0").sum(:final_score).to_i
+    self.games.select{|game| game.status = 2 && game.final_score > 0}.pluck(:final_score).sum.to_i
   end
 
   # 个人通关数
   def passed_count
-    self.games.where(status: 2).count
+    self.games.select{|game| game.status = 2}.size
   end
 
   # 通关时间
@@ -89,12 +89,12 @@ class Myshixun < ApplicationRecord
 
   # 耗时
   def total_spend_time
-    game_spend_time self.games.where(status: 2).sum(:cost_time).to_i
+    game_spend_time total_cost_time
   end
 
   # 通关总耗时
   def total_cost_time
-    self.games.where(status: 2).sum(:cost_time).to_i
+    self.games.select{|game| game.status = 2}.map(&:cost_time).sum.to_i
   end
 
 end
diff --git a/app/views/homework_commons/_homework_public_navigation.json.jbuilder b/app/views/homework_commons/_homework_public_navigation.json.jbuilder
index 2c803bee8..2c548074c 100644
--- a/app/views/homework_commons/_homework_public_navigation.json.jbuilder
+++ b/app/views/homework_commons/_homework_public_navigation.json.jbuilder
@@ -10,5 +10,5 @@ json.homework_name homework.name
 json.homework_id homework.id 
 json.homework_type homework.homework_type
 if homework.homework_type == "practice"
-  json.shixun_identifier homework.shixuns.first.try(:identifier)
+  json.shixun_identifier homework.shixuns.take.try(:identifier)
 end
diff --git a/app/views/homework_commons/index.json.jbuilder b/app/views/homework_commons/index.json.jbuilder
index d718550c1..5b9717c2f 100644
--- a/app/views/homework_commons/index.json.jbuilder
+++ b/app/views/homework_commons/index.json.jbuilder
@@ -2,10 +2,6 @@ json.course_identity @user_course_identity
 json.homework_type @homework_type
 json.course_public @course.is_public == 1
 json.is_end @course.is_end
-json.all_count @all_count
-json.published_count @published_count
-json.unpublished_count @all_count - @published_count
-json.task_count @task_count
 json.main_category_id @main_category.try(:id)
 json.main_category_name @main_category.try(:module_name)
 json.category_id @category.try(:id)
@@ -46,3 +42,8 @@ json.homeworks @homework_commons.each do |homework|
   end
 end
 
+json.all_count @all_count
+json.published_count @published_count
+json.unpublished_count @all_count - @published_count
+json.task_count @task_count
+
diff --git a/app/views/homework_commons/works_list.json.jbuilder b/app/views/homework_commons/works_list.json.jbuilder
index 0c1ed0c5b..42d4abf48 100644
--- a/app/views/homework_commons/works_list.json.jbuilder
+++ b/app/views/homework_commons/works_list.json.jbuilder
@@ -101,7 +101,6 @@ elsif @homework.homework_type == "group" || @homework.homework_type == "normal"
   json.anonymous_appeal @homework.anonymous_appeal
 
   json.student_works @student_works.each do |work|
-
     if @is_evaluation
       json.(work, :id, :work_status, :update_time)