ruby on rails新項目不使用數據庫，配置過程記錄

查詢了大神的經驗貼mysql http://stackoverflow.com/questions/19078044/disable-activerecord-for-rails-4sql http://stackoverflow.com/questions/821251/how-to-configure-ruby-on-rails-with-no-databaseruby 其中點贊最多的也是我用

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