导出调整

lib/tasks/zip_pack.rake

@@ -19,6 +19,7 @@ namespace :zip_pack do
         student_works = homework.score_student_works
 
         if student_works.size > 0
+          pdfs = []
           Zip::File.open(zipfile_name, Zip::File::CREATE) do |zip|
             student_works.find_each.map do |student_work|
               export = ExportShixunReportService.new(homework, student_work)