mail notifiacation 数据迁移

db/migrate/20161223030701_update_user_mail_notification.rb

@@ -0,0 +1,9 @@
+class UpdateUserMailNotification < ActiveRecord::Migration
+  def up
+    sql = "update `users` set mail_notification ='all' where mail_notification in ('day','week');"
+    execute(sql)
+  end
+
+  def down
+  end
+end