%script{:src => "//maps.google.com/maps/api/js?v=3.13&sensor=false&libraries=geometry", :type => "text/javascript"}
    %script{:src => "//google-maps-utility-library-v3.googlecode.com/svn/tags/markerclustererplus/2.0.14/src/markerclusterer_packed.js", :type => "text/javascript"}

........

    .col-lg-8.col-sm-8.col-md-8.col-xs-12
        #map
        %br/

......

    :javascript
        handler = Gmaps.build('Google');
        handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){
            markers = handler.addMarkers(#{raw @hash.to_json});
            handler.bounds.extendWith(markers);
            handler.fitMapToBounds();
            handler.getMap().setZoom(16);
        });

def show
    set_park
    @hash = Gmaps4rails.build_markers(@park) do |park, marker|
      marker.lat park.latitude
      marker.lng park.longitude
      marker.infowindow park.address
    end