班级作业，上传附件提交作品，重试后直接提交，提交页面附件不显示但验证弹框中被删除的附件又显示了

app/controllers/student_work_controller.rb

@@ -793,6 +793,7 @@ class StudentWorkController < ApplicationController
       end
     elsif @homework.homework_type == 1
       @work.update_attributes(:work_status => 0, :name => "#{@homework.name}的作品提交", :description => nil, :late_penalty => 0, :commit_time => nil)
+      @work.attachments.destroy_all
     end
     @student_work = StudentWork.new
     respond_to do |format|