2016-08-16 rails "Access denied for user 'root'@'localhost'" http://qiita.com/caramelbit/items/e9b08c6b11f762b949de http://railsdoc.com/references/rake%20db:migrate http://qiita.com/tetsuya/items/f21170a9667d7e465da8database.ymlの内容でデータベースを作成 rake db:create