fix bug

app/controllers/homework_commons_controller.rb

@@ -205,6 +205,9 @@ class HomeworkCommonsController < ApplicationController
               exercise_export_name = current_user.real_name + "_" + @course.name + "_" + @homework.name + "_" + Time.now.strftime('%Y%m%d_%H%M%S')
               render xlsx: "#{exercise_export_name.strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals:
                   {table_columns: @work_head_cells,task_users: @work_cells_column}
+              Rails.logger.info("############_____________@work_head_cells_________###############{@work_head_cells}")
+              Rails.logger.info("############_____________@work_cells_column_________###############{@work_cells_column}")
+
             else
               normal_status(-1,"暂无提交的学生！")
             end