班级作业缓存BUG修改

app/controllers/student_work_controller.rb

@@ -1067,7 +1067,7 @@ class StudentWorkController < ApplicationController
   def student_work_project
     @work = @homework.student_works.where("user_id = #{User.current.id} and work_status = 0").first
     if @work
-      @work.attribute('project_id', params[:projectName].to_i)
+      @work.update_attribute('project_id', params[:projectName].to_i)
     end
     @project = StudentWorkProject.new
     @project.homework_common_id = @homework.id