修改作业后，作业创建者会变为当前修改人

app/controllers/homework_common_controller.rb

@@ -92,7 +92,6 @@ class HomeworkCommonController < ApplicationController
     @homework.publish_time = params[:homework_common][:publish_time]
     @homework.homework_type = params[:homework_common][:homework_type]
     @homework.late_penalty = params[:late_penalty]
-    @homework.user_id = User.current.id
     @homework.course_id = @course.id
 
     #匿评作业相关属性