title: How to define object in array in Mongoose schema correctly with 2d geo index
body: <p>I'm currently having problems in creating a schema for the document below. The response from the server always returns the "trk" field values as [Object]. Somehow I have no idea how this should work, as I tried at least all approaches which made sense to me ;-)</p>
  
  <p>If this helps, my Mongoose version is 3.6.20 and MongoDB 2.4.7
  And before I forget, it would be nice to also set it as Index (2d)</p>
  
  <p>Original data:</p>
  
  <pre><code>{
      "_id": ObjectId("51ec4ac3eb7f7c701b000000"),
      "gpx": {
          "metadata": {
              "desc": "Nürburgring VLN-Variante",
              "country": "de",
              "isActive": true
          },
      "trk": [
      {
          "lat": 50.3299594,
          "lng": 6.9393006
      },
      {
          "lat": 50.3295046,
          "lng": 6.9390688
      },
      {
          "lat": 50.3293714,
          "lng": 6.9389939
      },
      {
          "lat": 50.3293284,
          "lng": 6.9389634
      }]
      }
  }
  </code></pre>
  
  <p>Mongoose Schema:</p>
  
  <pre><code>var TrackSchema = Schema({
              _id: Schema.ObjectId,
              gpx: {
                  metadata: {
                      desc: String,
                      country: String,
                      isActive: Boolean
                  },
                  trk: [{lat:Number, lng:Number}]
              }
          }, { collection: "tracks" });
  </code></pre>
  
  <p>The response from the Network tab in Chrome always looks like this (that's only the trk-part which is wrong) : </p>
  
  <pre><code>{ trk: 
        [ [Object],
          [Object],
          [Object],
          [Object],
          [Object],
          [Object],
  </code></pre>
  
  <p>I already tried different Schema definitions for "trk":</p>
  
  <ol>
  <li>trk: Schema.Types.Mixed </li>
  <li>trk: [Schema.Types.Mixed] </li>
  <li>trk:[ { type:[Number], index: "2d" }]</li>
  </ol>
  
  <p>Hope you can help me ;-)</p>