ruby on rails - Link back to page visited before form -

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i have listing page, form, thank page. need put link on thank page takes user page on before form varies. i've tried using this:

= link_to "back", :back

but takes them previous page, form.

well, can set method in form page collect url. basic idea use custom session variable store previous url , keep next session.

suppose form's action somecontroller#new, then

class somecontroller < applicationcontroller   after_filter "save_my_previous_url", only: [:new]    def save_my_previous_url     # session[:previous_url] rails built-in variable save last url.     session[:my_previous_url] = uri(request.referer || '').path   end  end

then in thank page, can my_previous_url by

 session[:my_previous_url]

this should able suit case, previous url 2 pages ago.

disclaimer: not verified. idea only.

add

session belongs controller. not helper can use directly in view. need define instance variable in controller , can use in view. this

# controller @back_url = session[:my_previous_url]  # view <%= link_to "back", @back_url %>

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