gistfile1.js

// controller
exports.createWave = function(req, res) {

  // buoys come in from client sorted
  var buoys = req.body.wave.buoys;

  // how would I add an index to them
  // and save below?

  var wave = new Wave({
    'name': req.body.wave.name,
    'location': {
      'lng': req.body.wave.location.lng,
      'lat': req.body.wave.location.lat
    },
    'buoys': buoys
  })
  wave.save(function(err) {
    if(err) {
      throw err;
    } 
    else {
      Wave.findOne({ _id: wave.id }, function(err, wave) {
        res.redirect('/waves/' + wave._id.toHexString())
      });
    }
  });
};

// data model

var Wave = new Schema({
  name: {
    type: String,
    required: true
  },
  location: {
    lng: Number,
    lat: Number
  },
  buoys: [{
    type: Schema.ObjectId,
    ref: 'Buoy'
  }],
  secret: Boolean
});

var Buoy= new Schema({
  name: {
    type: String,
    required: true
  },
  mid: String, 
  cdipId: String,
  location: {
    lng: Number,
    lat: Number
  }
});