gistfile1.txt

// ReactMap.jsx

var GoogleMap = GoogleMapReact.GoogleMap;

var ReactMap = React.createClass({
  render: function() {
    return (
      <div style={{height: 400}}>
        <h1>MAP</h1>
        <GoogleMap center={[59.938043, 30.337157]} zoom={12}/>
      </div>
    );
  }
});


##application.html.erb 

<script src="https://rawgithub.com/istarkov/google-map-react/umd-build/lib/umd/GoogleMapReact.js"></script>


Errors: 
Warning: Unknown DOM property class. Did you mean className?
react-1ed468f6634e7db63bce66fc4c2be083.js?body=1:19589 Warning: React.createElement: type should not be null or undefined. It should be a string (for DOM elements) or a ReactClass (for composite components).
react-1ed468f6634e7db63bce66fc4c2be083.js?body=1:19589 Warning: Only functions or strings can be mounted as React components.
Uncaught TypeError: Cannot read property 'context' of null
Uncaught TypeError: Cannot read property 'toUpperCase' of undefined