迁移

db/migrate/20191213101853_migrate_student_work_compelete_status.rb

@@ -2,10 +2,10 @@ class MigrateStudentWorkCompeleteStatus < ActiveRecord::Migration[5.2]
   def change
     student_works = StudentWork.where("myshixun_id is not null and myshixun_id != 0")
     student_works.includes(homework_common: :homework_challenge_settings, myshixun: :games).find_each do |work|
-      if work.myshixun
+      if work.myshixun && work.homework_common
         myshixun = work.myshixun
         homework= work.homework_common
-        setting_time = homework.homework_group_setting myshixun.user_id
+        setting_time = homework.homework_group_setting(myshixun.user_id)
         homework_end_or_late_time = homework.allow_late ? homework.late_time : setting_time.end_time
         challenge_ids = homework.homework_challenge_settings.pluck(:challenge_id)
         games = myshixun.games.select{ |game| challenge_ids.include?(game.challenge_id) }