增加作业显示列表首先按评分排序，然后按时间排序

app/controllers/bids_controller.rb

@@ -412,7 +412,7 @@ class BidsController < ApplicationController
       #增加作业按评分排序，
       @homework_list = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
         (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id) AS score
-        FROM homework_attaches WHERE bid_id = #{@bid.id} ORDER BY score DESC",:include => [:attachments])
+        FROM homework_attaches WHERE bid_id = #{@bid.id} ORDER BY score DESC,created_at ASC",:include => [:attachments])
       if params[:student_id].present?
         @temp = []
         @homework_list.each do |pro|