ruby on rails - pass variable through render -


i making nested form, done in railscasts , have problem render. in form have 

 <% form_for @question, :url => user_questions_path, :html => {:multipart => true} |f| %>            <%= f.label :name %>           <%= f.text_field :name, :class => "text_input" %>           <%= f.label :description %>           <%= f.text_area :description, :cols => "1", :rows => "1", :class => "textarea" %>            <div id="reg">            <%= render :partial => "user_form", :f => f %>           </div>             ... <% end %>

and in user_form file have

<% f.fields_for :user |builder| %>              <%= builder.label :email %>              <%= builder.text_field :email, :class => "text_input" %>              <%= builder.label :password %>              <%= builder.text_field :password, :class => "text_input" %>              <%= builder.label :password_confirmation %>              <%= builder.text_field :password_confirmation, :class => "text_input" %>              <% builder.fields_for :user_profile, @question.user.user_profile || @question.user.build_user_profile |u| %>                  <%= u.label :secondname %>                  <%= u.text_field :secondname, :class => "text_input" %>                  <%= u.label :firstname %>                  <%= u.text_field :firstname, :class => "text_input" %>              <% end %> <% end %>

i have error in first line of partial

undefined local variable or method `f' for

what doing wrong?(i using rails 2.3, in cast rails 2 used too). in advance

i think may need change

<%= render :partial => "user_form", :f => f %>

to 1 of following:

<%= render "user_form", :f => f %> <%= render :partial => "user_form", :locals => {:f => f} %>

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