作品列表页面性能提升（主要是数据库查询减少，建立相关索引）

app/controllers/student_work_controller.rb

@@ -338,41 +338,17 @@ class StudentWorkController < ApplicationController
   end
 
   def index
-    # 作业消息状态更新
-    @homework.course_messages.each do |homework_message|
-      if User.current.id == homework_message.user_id && homework_message.viewed == 0
-        homework_message.update_attributes(:viewed => true) if homework_message.viewed == 0
-      end
-    end
-
-    #修改作品提示消息更新
-    student_work_messages = CourseMessage.where("user_id =? and course_id =? and course_message_type =? and viewed =?", User.current.id, @homework.course, StudentWork.name, 0)
-    student_work_messages.each do |message|
-      message.update_attribute(:viewed, true)
-    end
-
+    # 作业消息状态更新?
+    homeworkcommon_messages = CourseMessage.where(:user_id => User.current.id, :viewed => 0, :course_message_id => @homework.id, :course_message_type => "HomeWorkCommon")
+    homeworkcommon_messages.update_all(:viewed => true)
+    studentwork_messages = CourseMessage.where(:user_id => User.current.id, :viewed => 0, :course_id => @homework.course, :course_message_type => "StudentWork")
+    studentwork_messages.update_all(:viewed => true)
     # 作品打分消息状态更新
     studentworks_scores = CourseMessage.where("user_id =? and course_id =? and course_message_type =? and viewed =?", User.current.id, @homework.course, "StudentWorksScore", 0)
-    studentworks_scores.each do |studentworks_score|
-      studentworks_score.update_attributes(:viewed => true) if studentworks_score.viewed == 0
-    end
+    studentworks_scores.update_all(:viewed => true)
     # 作品评论消息状态更新
     journals_for_teacher = CourseMessage.where("user_id =? and course_id =? and course_message_type =? and viewed =?", User.current.id, @homework.course, "JournalsForMessage", 0)
-    journals_for_teacher.each do |journal_for_teacher|
-      journal_for_teacher.update_attributes(:viewed => true)
-    end
-    #不能参与作业匿评消息状态更新
-    no_evaluation = CourseMessage.where("user_id =? and course_id =? and course_message_type =? and viewed =? and status =?", User.current.id, @homework.course, "StudentWork", 0, 0)
-    no_evaluation.update_all(:viewed => true)
-    # 作品留言
-    # 消息end
-    #设置作业对应的forge_messages表的viewed字段
-    query_student_work = @homework.course_messages
-    query_student_work.each do |query|
-      if User.current.id == query.user_id
-        query.update_attributes(:viewed => true)
-      end
-    end
+    journals_for_teacher.update_all(:viewed => true)
     ##################################################################################################################
     @order,@b_sort,@name,@group = params[:order] || "score",params[:sort] || "desc",params[:name].to_s.strip || "",params[:group]
     @homework_commons = @course.homework_commons.where("publish_time <= ?",Time.now.strftime("%Y-%m-%d")).order("created_at desc")

app/views/student_work/_evaluation_title.html.erb

@@ -29,7 +29,7 @@
       我的评分
     </th>
   </tr>
-  <% @stundet_works.each_with_index do |student_work, i|%>
+  <% @stundet_works.includes(:user => {:user_extensions => []}, :project => {}).each_with_index do |student_work, i|%>
           <%= render :partial => "evaluation_work", :locals => {:student_work => student_work, :index => i}%>
       <tr>
         <td colspan="12">

app/views/student_work/_evaluation_un_title.html.erb

@@ -74,7 +74,7 @@
         </th>
       </tr>
   <%# end %>
-  <% @stundet_works.each_with_index do |student_work, i| %>
+  <% @stundet_works.includes(:user => {:user_extensions => []}, :project => {}, :student_works_scores => {}).each_with_index do |student_work, i| %>
       <%= render :partial => "evaluation_un_work", :locals => {:student_work => student_work, :index => i} %>
       <tr>
         <td colspan="12">

db/migrate/20160913063446_add_index_to_student_works_scores.rb

@@ -0,0 +1,6 @@
+class AddIndexToStudentWorksScores < ActiveRecord::Migration
+  def change
+    add_index :student_works_scores, :user_id, name: 'user_id'
+    add_index :student_works_scores, :student_work_id, name: 'student_work_id'
+  end
+end