字段名字错误

app/services/courses_service.rb

@@ -330,7 +330,7 @@ class CoursesService
   def homework_list params,current_user
     course = Course.find(params[:id])
     if course.is_public != 0 || current_user.member_of_course?(course)
-      bids = course.homework_commons.page(1).per(3).order('end_time DESC')
+      bids = course.homework_commons.page(1).per(3).order('created_at DESC')
       bids = bids.like(params[:name]) if params[:name].present?
       homeworks = []
       bids.each do |bid|