rails3.1にしたら出たワーニング。
How to do attr_accessor_with_default in ruby?
http://stackoverflow.com/questions/7052509/how-to-do-attr-accessor-with-default-in-ruby
属性のデフォルト値を設定したかったら、after_initializeでやってね。ってことみたい。
More than 5 years have passed since last update.
DEPRECATION WARNING: attr_accessor_with_default is deprecated. Use Ruby instead!.
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