调整

app/controllers/homework_commons_controller.rb

@@ -173,8 +173,8 @@ class HomeworkCommonsController < ApplicationController
         end
 
         # 排序
-        rorder = params[:order] || "update_time"
+        rorder = params[:order].blank? ? "update_time" : params[:order]
-        b_order = params[:b_order] || "desc"
+        b_order = params[:b_order].blank? ? "desc" : params[:b_order]
         if rorder == "update_time" || rorder == "work_score"
           @student_works = @student_works.order("student_works.#{rorder} #{b_order}")
         elsif rorder == "student_id"