I installed gmaps4rails for my Rails app, ran the generator, and required the two files like this in my application.js file, along with underscore.js

//= require underscore
//= require gmaps4rails/gmaps4rails.base
//= require gmaps4rails/gmaps4rails.googlemaps

adding, as instructed on github https://github.com/apneadiving/Google-Maps-for-Rails, these dependencies in layout.html.erb

When I tried to create the demo map from the github page with this code, I got an error that the object doesn't have a build method.

Uncaught TypeError: Object # has no method 'build'

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();
});

Indeed, when I look inside the base file that I require in the manifest file there is no build method for that object.

How does one create a map in the new version for gmaps4rails?