ruby-on-rails - 显示方向信息 gmaps4rails

Question

我可以使用gmaps4rails gem在我的 rails 应用程序中的地图上显示路线，但我无法获得诸如行驶时间和距离等信息以在任何地方显示。

wiki谈到了显示一个面板，但我也没有让它工作。

<div id="instructions"></div>
<%= gmaps("map_options" => {
    "zoom" => 14,
    "auto_adjust" => false,
    "center_latitude" => @location.latitude,
    "center_longitude" => @location.longitude
  },
  "markers" => { "data" => @json },
  "direction"   => { 
    "data" => {
      "from" => @location.address,
      "to" => "Cleveland, OH"
    },
    "travelMode" => "DRIVING",
    "display_panel" => true,
    "panel_id" => "instructions"
  }) %>