diff --git a/app/models/hack_code.rb b/app/models/hack_code.rb
index 19de5e4a4..b765a1358 100644
--- a/app/models/hack_code.rb
+++ b/app/models/hack_code.rb
@@ -1,3 +1,4 @@
 class HackCode < ApplicationRecord
   # 编程题代码相关
+  belongs_to :hack
 end
diff --git a/db/migrate/20200223021427_sync_subjectds_mobile.rb b/db/migrate/20200223021427_sync_subjectds_mobile.rb
index 1d9f23a37..72b4ee18e 100644
--- a/db/migrate/20200223021427_sync_subjectds_mobile.rb
+++ b/db/migrate/20200223021427_sync_subjectds_mobile.rb
@@ -1,7 +1,7 @@
 class SyncSubjectdsMobile < ActiveRecord::Migration[5.2]
   def change
     SubDisciplineContainer.where(container_type: "Subject").find_each do |sc|
-      Subject.find(sc.container_id).update_column('show_mobile', true)
+      Subject.find(sc.container_id).update_column("show_mobile", true)
     end
   end
 end