I am looking to have a wizard with three steps. The first to collect information necessary to build the model. It is necessary that I do this in steps because the model form is build dynamically based on the step 1 and step 2.

new_widget_controller.rb

class NewWidgetController < ApplicationController
  include Wicked::Wizard

  steps :select_data_set, :select_type, :widget_settings
  
  def show
    render_wizard
  end
  
  def update
    case step
    when :select_data_set
      # Catch form values and send them to the next step
      # How do I render the next wizard step with the additional parameters?
    when :select_type
      # Catch form values and send them to the next step
    when :widget_settings
      # Build model and create
    end
    
    render_wizard
  end
  
end

select_data_set.html.haml

- title "Choose your ammunition..."

= form_tag new_widget_path, :url => wizard_path, :method => :put, :class=>'form-horizontal' do
  .control-group
    = label_tag "Data set", nil, :class=>'control-label'
    .controls
    - options = DataSet.all.map { |data_set| [data_set.name,data_set.id] }
    = select_tag :type, options_for_select(options)
  .form-actions
    = submit_tag :next, :class=>'btn btn-primary'