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#174
地域(Region)を全国のdojo一覧で使用したいので、都道府県テーブル(prefectures)を追加して
Dojo belongs_to Prefecture
としました。ActiveHashを使うという手もあると思うんですが、
後々イベント履歴の統計情報をSQLで抽出することを考えると、
テーブルとして持っておいたほうが良さそうだったのでマスターテーブルにしました。