actionview/lib/action_view/helpers/form_helper.rb
Required Files
cgiaction_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