Rails自带了development、test和production三个environments 我们可以添加Staging

database.yml

staging:    adapter: mysql    database: store_staging    user: root    password:     host: localhost

 添加enviromnets/staging.rb

# ...  config.log_level = :debug  # ...

 创建数据库

mysqladmin create store_staging -u root -p  rake db:migrate RAILS_EVN=staging

 启动

rails s -e staging