调整

app/views/homework_commons/index.json.jbuilder

@@ -25,14 +25,16 @@ json.homeworks @homework_commons.each do |homework|
 
   if @user_course_identity < Course::STUDENT
     if homework.homework_type == "practice"
-      json.shixun_identifier homework.shixuns.first.try(:identifier)
+      json.shixun_identifier homework.shixuns.take.try(:identifier)
     end
   elsif @user_course_identity == Course::STUDENT
     if homework.homework_type == "practice"
+      shixun = homework.shixuns.take
       # json.challenge_count homework.shixuns.first.try(:challenges_count).to_i
       current_myshixun = homework.user_work(@user.id).try(:myshixun)
+      myshixun = current_myshixun ? current_myshixun : shixun.myshixuns.find_by(user_id: @user.id)
       # json.game_count current_myshixun ? current_myshixun.exec_count : 0
-      json.task_operation task_operation_url(current_myshixun, homework.shixuns.first)
+      json.task_operation task_operation_url(current_myshixun, shixun)
     else
       work = homework.user_work(@user.id)
       json.work_id work.try(:id)