From 417d0793f896682646db75978a1835aafbdfbe8e Mon Sep 17 00:00:00 2001
From: daiao <358551898@qq.com>
Date: Tue, 23 Jul 2019 23:28:47 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=A0=E9=99=A4=E7=A9=BA=E7=99=BD=E7=9A=84?=
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---
 ...3152256_delete_contents_is_null_for_challenge_answers.rb | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 db/migrate/20190723152256_delete_contents_is_null_for_challenge_answers.rb

diff --git a/db/migrate/20190723152256_delete_contents_is_null_for_challenge_answers.rb b/db/migrate/20190723152256_delete_contents_is_null_for_challenge_answers.rb
new file mode 100644
index 000000000..a85152894
--- /dev/null
+++ b/db/migrate/20190723152256_delete_contents_is_null_for_challenge_answers.rb
@@ -0,0 +1,6 @@
+class DeleteContentsIsNullForChallengeAnswers < ActiveRecord::Migration[5.2]
+  def change
+    contents = ChallengeAnswer.where("contents = ''")
+    contents.delete_all
+  end
+end