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How to re-render a graph at a given interval that retrieves data from a controller in Rails?
var ajax_path = #{action_controller_path}
function pollData() {
  $.ajax({
    type: 'get',
    url: ajax_path,
    success: function(data) {
      // update chart
      var series = chart.series[0],
            shift = series.data.length > 20; // shift if the series is longer than 20
      chart.series[0].addPoint(data, true, shift);

      setTimeout(pollData, 60000) // Poll data every 60s
    }
  });
}

respond_to :json, only: [:polling_action]
def polling_action
  @data_point = Model.get_data
  respond_with @data_point
end