Gmaps4rails: How to create rich marker in javascript?
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I add a marker to user location like this:

    Gmaps.map.callback = function() {
      Gmaps.map.createMarker({Lat: lat,
                              Lng: lng, 
                              rich_marker: null, 
                              marker_picture: ""
      });
    }
, but I'd like to change the image of the marker. Rich marker seems to be the solution, but I can't get the rich_marker constructed correctly.

Could anyone give an example of rich marker construction.