{% if google_analytics_id %}
    <script>
      (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
      (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
      m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
      })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

    {% if user.is_authenticated %}
      ga('create', '{{ google_analytics_id }}', { 'userId': '{{ user.pk }}' });
    {% else %}
      ga('create', '{{ google_analytics_id }}');
    {% endif %}
      ga('send', 'pageview');
      {% block extratracking %}{% endblock %}
    </script>
{% endif %}
