circles

Controller: 
 @hash = Gmaps4rails.build_markers(@users) do |user, marker|
        marker.lat user.location.latitude
        marker.lng user.location.longitude
        marker.infowindow user.email
   end

View:
<script>
handler = Gmaps.build('Google');
handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){
	markers = handler.addMarkers(<%=raw @hash.to_json %>);

  	handler.bounds.extendWith(markers);
  	handler.fitMapToBounds();
});
</script>