Add Object Link helper function - great for nested form fields.

nested_form_helper.rb

module NestedFormHelper
  def add_object_link(name, form, object, partial, where)
    html = render(:partial => partial, :locals => { :form => form}, :object => object)
    link_to_function name, %{
      var new_object_id = new Date().getTime() ;
      var html = jQuery('#{where}').append('#{html.gsub(/\n/, ' ')}');
    }
  end
end