Rails: undefined method text_field_tag
问题 My ERB file works fine if I use text_field , but if I switch to text_field_tag I receive this error: undefined method `text_field_tag' for #<ActionView::Helpers::FormBuilder:0x00000001f6fd50> Here is the code that works: <%= f.text_field mystring %> And the code that does not work: <%= f.text_field_tag mystring %> text_field_tag is documented. How to make it work? Do I need a require or something? 回答1: For your information, text_field_tag is from ActionView::Helpers::FormTagHelper , which