1// import async to make control flow simplier
 2var async = require('async');
 3
 4// import the rest of the normal stuff
 5var mongoose = require('../../lib');
 6
 7require('./person.js')();
 8
 9var Person = mongoose.model('Person');
10
11// define some dummy data
12var data = [
13  {
14    name: 'bill',
15    age: 25,
16    birthday: new Date().setFullYear((new Date().getFullYear() - 25))
17  },
18  {
19    name: 'mary',
20    age: 30,
21    birthday: new Date().setFullYear((new Date().getFullYear() - 30))
22  },
23  {
24    name: 'bob',
25    age: 21,
26    birthday: new Date().setFullYear((new Date().getFullYear() - 21))
27  },
28  {
29    name: 'lilly',
30    age: 26,
31    birthday: new Date().setFullYear((new Date().getFullYear() - 26))
32  },
33  {
34    name: 'alucard',
35    age: 1000,
36    birthday: new Date().setFullYear((new Date().getFullYear() - 1000))
37  }
38];
39
40
41mongoose.connect('mongodb://localhost/persons', function(err) {
42  if (err) {
43    throw err;
44  }
45
46  // create all of the dummy people
47  async.each(data, function(item, cb) {
48    Person.create(item, cb);
49  }, function(err) {
50    if (err) {
51      // handle error
52    }
53
54    // create a promise (get one from the query builder)
55    var prom = Person.find({age: {$lt: 1000}}).exec();
56
57    // add a callback on the promise. This will be called on both error and
58    // complete
59    prom.addBack(function() {
60      console.log('completed');
61    });
62
63    // add a callback that is only called on complete (success) events
64    prom.addCallback(function() {
65      console.log('Successful Completion!');
66    });
67
68    // add a callback that is only called on err (rejected) events
69    prom.addErrback(function() {
70      console.log('Fail Boat');
71    });
72
73    // you can chain things just like in the promise/A+ spec
74    // note: each then() is returning a new promise, so the above methods
75    // that we defined will all fire after the initial promise is fulfilled
76    prom.then(function(people) {
77      // just getting the stuff for the next query
78      var ids = people.map(function(p) {
79        return p._id;
80      });
81
82      // return the next promise
83      return Person.find({_id: {$nin: ids}}).exec();
84    }).then(function(oldest) {
85      console.log('Oldest person is: %s', oldest);
86    }).then(cleanup);
87  });
88});
89
90function cleanup() {
91  Person.remove(function() {
92    mongoose.disconnect();
93  });
94}