diff --git a/app/controllers/challenges_controller.rb b/app/controllers/challenges_controller.rb
index ebce98b62..9e87d3799 100644
--- a/app/controllers/challenges_controller.rb
+++ b/app/controllers/challenges_controller.rb
@@ -151,7 +151,7 @@ class ChallengesController < ApplicationController
   def index
     uid_logger("identifier: #{params}")
 
-    @challenges = Challenge.fields_for_list.where(shixun_id: @shixun.id)
+    @challenges = @shixun.challenges.fields_for_list
 
     @editable = @shixun.status == 0 # before_action：有判断权限，如果没发布，则肯定是管理人员
     @user = current_user
diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 7f2519b99..c8cf36824 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -1459,7 +1459,8 @@ class HomeworkCommonsController < ApplicationController
             if game_codes.count > 0
               code_rate += game_codes.map(&:rate).sum / challenge.path.split("；").length
             end
-            target = game_codes.count > 0 ? game_codes[0].target_user_id : nil
+            logger.info("#####game_codes: #{game_codes}")
+            #target = game_codes.count > 0 ? game_codes[0].target_user_id : nil
             # 作品完成时间
             game = challenge.games.find_by(user_id: @user.id)
             end_time = game.end_time
@@ -1467,7 +1468,7 @@ class HomeworkCommonsController < ApplicationController
             all_score = homework_challenge_settings.find_by(challenge_id: challenge.id).try(:score).to_f
             final_score = @student_work.work_challenge_score game, all_score
             # 抄袭用户
-            copy_user = User.find_by_id(game_codes[0].target_user_id)
+            copy_user = User.find_by_id(game_codes[0].try(:target_user_id))
             copy_end_time = copy_user.games.find_by(challenge_id: challenge.id).try(:end_time) if copy_user.present?
             # 代码部分
             code_list = []
@@ -1477,7 +1478,7 @@ class HomeworkCommonsController < ApplicationController
                 code_list << {path: path, origin_content: info.origin_content, target_content: info.target_content}
               end
             end
-
+            # TODO: 这里本来应该前端做的，但是现在页面已经刷不开了。
             {code_rate: code_rate, copy_user_id: copy_user.try(:id), end_time: end_time, final_score: final_score,
              all_score: all_score, copy_end_time: copy_end_time, copy_username: copy_user.try(:full_name),
              username: game.user.full_name, code_list: code_list, subject: challenge.subject, position: challenge.position,