所需文件
- active_support/core_ext/module/attr_internal
- active_support/core_ext/module/attribute_accessors
- active_support/ordered_options
- action_view/log_subscriber
- action_view/helpers
- action_view/context
- action_view/template
- action_view/lookup_context
命名空间
- 模块 ActionView
- 模块 ActiveSupport
- 类 ActionView::Base