必需文件
- securerandom
- active_support/dependencies/autoload
- active_support/version
- active_support/deprecator
- active_support/logger
- active_support/broadcast_logger
- active_support/lazy_load_hooks
- active_support/core_ext/date_and_time/compatibility
命名空间
- 模块 ActiveSupport
- 模块 DateAndTime