Two step new example for Chris

new.html.erb

<%= simple_form_for(@model, :url => step2_two_step_new_path, :method => :post) do |form| %>
    <%= form.input :name %>
    <%= form.input :description %>
    <%= form.button :submit, "Next" %>
<% end %>

step2.html.erb

<%= simple_form_for(@model) do |form| %>
    <%= form.input :name, as: :hidden %>
    <%= form.input :description, as: :hidden %>
    <%= form.input :extra_field %>
    <%= form.input :extra_field2 %>
    <%= form.button :submit, "create" %>
<% end %>

two_step_new_controller.rb

class TwoStepNewController < ApplicationController

  def new
    @model = Model.new
  end
  # Make sure you add step2 as a collection method on your routes resources.
  def step2
    @model = Model.new(params[:model])
  end
end