MacPortsでインストールしたMySQL5を使用。 rake db:createで次のようなエラーが出た。 Couldn't create database for {"reconnect"=>false, "encoding"=>"utf8", "username"=>***, "adapter"=>"mysql", "database"=>"TestApp_development", "host"=>"localhost", "pool"=>5, "password"=>***, "socket"=>"/opt/local/var/run/mysql5/mysqld.sock"}, charset: utf8, collation: utf8_general_ci (if you set the charset manually, make sure you have a matc