app/assets/javascripts/google_analytics.js.erb:

google_analytics.js.erb

<% if Rails.env == 'production' %>
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-XXXXXXX-XX']);
  _gaq.push(['_trackPageview']);
  ga_src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
  $.externalScript(ga_src).done(function(script, textStatus) {
    console.log('Script loading: ' + textStatus );
    if (typeof _gat != 'undefined') {
      console.log('Okay. GA file loaded.');
    }
    else
    {
      console.log('Problem. GA file not loaded.');
    }
  });
<% end %>