必需文件
- erb
- active_support/core_ext/string/output_safety
- active_support/core_ext/array/extract_options
- active_support/core_ext/array/wrap
- action_view/helpers/text_helper
命名空间
- 模块 ActionView
- MODULE ActionView::Helpers
- MODULE ActionView::Helpers::FormOptionsHelper
- MODULE ActionView::Helpers::Tags
- CLASS ActionView::Helpers::FormBuilder