school为0的情况数据迁移

db/migrate/20160914073340_update_user_extensions.rb

@@ -0,0 +1,9 @@
+class UpdateUserExtensions < ActiveRecord::Migration
+  def up
+    ues = UserExtensions.where(:school_id => 0)
+    ues.update_all(:school_id => nil)
+  end
+
+  def down
+  end
+end