必需文件
- cgi
- action_view/helpers/date_helper
- action_view/helpers/url_helper
- action_view/helpers/form_tag_helper
- action_view/helpers/active_model_helper
- action_view/model_naming
- action_view/record_identifier
- active_support/code_generator
- active_support/core_ext/module/attribute_accessors
- active_support/core_ext/hash/slice
- active_support/core_ext/string/output_safety
- active_support/core_ext/string/inflections
命名空间