how to generate AuthenticityToken on rails

Question

I build the form tag by myself and when I post the form to server it give me a InvalidAuthenticityToken error, so I want to know how to add it in my own in curr

Answer 1

This answer is first for rails form token tag in Google so to keep it simpler for future googling generations: just use token_tag, it's a helper defined in ActionView::Helpers::UrlHelper that returns hidden input with form_authenticity_token as default value.