Select item from chosen js select with Capybara 2+ and Selenium

gistfile1.rb

def select_from_chosen(item_text, options)
  field = find_field(options[:from], visible: false)
  option_value = page.evaluate_script("$(\"##{field[:id]} option:contains('#{item_text}')\").val()")
  page.execute_script("value = ['#{option_value}']\; if ($('##{field[:id]}').val()) {$.merge(value, $('##{field[:id]}').val())}")
  option_value = page.evaluate_script("value")
  page.execute_script("$('##{field[:id]}').val(#{option_value})")
  page.execute_script("$('##{field[:id]}').trigger('liszt:updated').trigger('change')")
end