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command line

rails genarate scaffold user company name address:text picture

rails g gmaps4rails:copy_coffee

rails generate migration AddLatitudeAndLongitudeToUser latitude:float longitude:float

index.html.erb

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


<div style='width: 800px;'>
  <div id="map" style='width: 800px; height: 400px;'></div>
</div>



<script type="text/javascript">
  handler = Gmaps.build('Google');
  handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){
    markers = handler.addMarkers([
      {
        "lat": 0,
        "lng": 0,
        "picture": {
          "url": "https://addons.cdn.mozilla.net/img/uploads/addon_icons/13/13028-64.png",
          "width":  36,
          "height": 36
        },
        "infowindow": "hello!"
      }
    ]);
    handler.bounds.extendWith(markers);
    handler.fitMapToBounds();
  });
</script>