formtastic_helpers.rb

module FormtasticHelpers
  # Verifies that date elements (year, month, day) exist on the current page,
  # for a form built with Formtastic.
  def select_formtastic_date(date_to_select, options={})
    date = date_to_select.is_a?(Date) || date_to_select.is_a?(Time) ?
                    date_to_select : Date.parse(date_to_select)
    
    label = options[:from]
    
    doc = Nokogiri::HTML(response.body)
    
    # Formtastic renders a span with class label for date fields.
    # /li/fieldset/legend/span
    results = doc.xpath(%Q{//span[contains(text(), "#{label}")][@class="label"]})

    result = results.first
    
    # Grab the ID of the parent LI.
    date_select_inputs_id = result.parent.parent.parent["id"]
    id_prefix = date_select_inputs_id.gsub(/_input$/, '')
    
    select date.year, :from => "#{id_prefix}_#{Webrat::Scope::DATE_TIME_SUFFIXES[:year]}"
    select date.strftime('%B'), :from => "#{id_prefix}_#{Webrat::Scope::DATE_TIME_SUFFIXES[:month]}"
    select date.day, :from => "#{id_prefix}_#{Webrat::Scope::DATE_TIME_SUFFIXES[:day]}"
  end
end

World(FormtasticHelpers)