Select the first item from Ajax-Chosen field using Capybara with Selenium web driver

select_from_ajax_chosen.rb

def select_from_ajax_chosen(item_text, field_id)
  within "##{field_id}_chzn" do
    find('a.chzn-single').click
    input = find("div.chzn-search input")
    item_text.each_char do |char|
      input.native.send_keys char
    end
    sleep 1
    input.native.send_keys :arrow_down
    input.native.send_keys :return
    within 'a.chzn-single' do
      page.should have_content item_text
    end
  end
end