app/views/layouts/_clicky.html.erb
<script>var clicky_site_ids = clicky_site_ids || []; clicky_site_ids.push(101182533);</script>
<script async src="//static.getclicky.com/js"></script>
<% if user_signed_in? %>
<script type="text/javascript">
var clicky_custom = clicky_custom || {};
clicky_custom.visitor = {
username: '<%= current_user.id %>'
};
</script>
<% end %>