[Rails] JQuery+AJAX partial in form_for

Hi! I want to render partial which depends on form builder "f". How can
I do it using AJAX+JQuery

Files
#new.html.haml
%h1
New order
- form_for(@order) do |f|
= f.error_messages
%div#partial
= render "#{@order.current_step}_step", :f => f

#create.js.erb
$("#partial").empty();
$("#partial").append
( <%= render "#{@order.current_step}_step", :locals => {:f=>f}%>);

The error
undefined local variable or method `f' for ActionView::Base
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