Google Analytics Rails helper

ga_helper.rb

# ERB:
#
#   <%= google_analytics 'UA-XXXXXXXX-X' %>
# </head>
#
# Haml:
#
#   = google_analytics('UA-XXXXXXXX-X')
# %body
 
# put the following snippet in application_helper.rb
 
  def google_analytics(id = nil)
    content_tag(:script, type: 'text/javascript') do
"var _gaq = _gaq || [];
_gaq.push(['_setAccount', '#{id}']);
_gaq.push(['_trackPageview']);
(function() {
  var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
  ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
  var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})()".html_safe
    end if id.present? && Rails.env.production?
  end