chat-server/qq-imsvr/node_modules/mongoose/examples/geospatial/geospatial.js

// import async to make control flow simplier
var async = require('async');

// import the rest of the normal stuff
var mongoose = require('../../lib');

require('./person.js')();

var Person = mongoose.model('Person');

// define some dummy data
var data = [
  { name : 'bill', age : 25, birthday : new Date().setFullYear((new
    Date().getFullYear() - 25)), gender : "Male",
    likes : ['movies', 'games', 'dogs'], loc : [0, 0]},
  { name : 'mary', age : 30, birthday : new Date().setFullYear((new
    Date().getFullYear() - 30)), gender : "Female",
    likes : ['movies', 'birds', 'cats'], loc : [1, 1]},
  { name : 'bob', age : 21, birthday : new Date().setFullYear((new
    Date().getFullYear() - 21)), gender : "Male",
    likes : ['tv', 'games', 'rabbits'], loc : [3, 3]},
  { name : 'lilly', age : 26, birthday : new Date().setFullYear((new
    Date().getFullYear() - 26)), gender : "Female",
    likes : ['books', 'cats', 'dogs'], loc : [6, 6]},
  { name : 'alucard', age : 1000, birthday : new Date().setFullYear((new
    Date().getFullYear() - 1000)), gender : "Male",
    likes : ['glasses', 'wine', 'the night'], loc : [10, 10]},
];


mongoose.connect('mongodb://localhost/persons', function (err) {
  if (err) throw err;

  // create all of the dummy people
  async.each(data, function (item, cb) {
    Person.create(item, cb);
  }, function (err) {
    
    // let's find the closest person to bob
    Person.find({ name : 'bob' }, function (err, res) {
      if (err) throw err;

      res[0].findClosest(function (err, closest) {
        if (err) throw err;

        console.log("%s is closest to %s", res[0].name, closest);
        

        // we can also just query straight off of the model. For more
        // information about geospatial queries and indexes, see
        // http://docs.mongodb.org/manual/applications/geospatial-indexes/
        var coords = [7,7];
        Person.find({ loc : { $nearSphere : coords }}).limit(1).exec(function(err, res) {
          console.log("Closest to %s is %s", coords, res);
          cleanup();
        });
      });
    });
  });
});

function cleanup() {
  Person.remove(function() {
    mongoose.disconnect();
  });
}