1
  2var assert = require('assert')
  3var mongoose = require('../');
  4var Schema = mongoose.Schema;
  5var ObjectId = mongoose.Types.ObjectId;
  6
  7/**
  8 * Connect to the db
  9 */
 10
 11var dbname = 'testing_populateAdInfinitum_' + require('../lib/utils').random()
 12mongoose.connect('localhost', dbname);
 13mongoose.connection.on('error', function() {
 14  console.error('connection error', arguments);
 15});
 16
 17/**
 18 * Schemas
 19 */
 20
 21var user = new Schema({
 22  name: String,
 23  friends: [{
 24    type: Schema.ObjectId,
 25    ref: 'User'
 26  }]
 27});
 28var User = mongoose.model('User', user);
 29
 30var blogpost = Schema({
 31  title: String,
 32  tags: [String],
 33  author: {
 34    type: Schema.ObjectId,
 35    ref: 'User'
 36  }
 37})
 38var BlogPost = mongoose.model('BlogPost', blogpost);
 39
 40/**
 41 * example
 42 */
 43
 44mongoose.connection.on('open', function() {
 45
 46  /**
 47   * Generate data
 48   */
 49
 50  var userIds = [new ObjectId, new ObjectId, new ObjectId, new ObjectId];
 51  var users = [];
 52
 53  users.push({
 54    _id: userIds[0],
 55    name: 'mary',
 56    friends: [userIds[1], userIds[2], userIds[3]]
 57  });
 58  users.push({
 59    _id: userIds[1],
 60    name: 'bob',
 61    friends: [userIds[0], userIds[2], userIds[3]]
 62  });
 63  users.push({
 64    _id: userIds[2],
 65    name: 'joe',
 66    friends: [userIds[0], userIds[1], userIds[3]]
 67  });
 68  users.push({
 69    _id: userIds[3],
 70    name: 'sally',
 71    friends: [userIds[0], userIds[1], userIds[2]]
 72  });
 73
 74  User.create(users, function(err, docs) {
 75    assert.ifError(err);
 76
 77    var blogposts = [];
 78    blogposts.push({
 79      title: 'blog 1',
 80      tags: ['fun', 'cool'],
 81      author: userIds[3]
 82    })
 83    blogposts.push({
 84      title: 'blog 2',
 85      tags: ['cool'],
 86      author: userIds[1]
 87    })
 88    blogposts.push({
 89      title: 'blog 3',
 90      tags: ['fun', 'odd'],
 91      author: userIds[2]
 92    })
 93
 94    BlogPost.create(blogposts, function(err, docs) {
 95      assert.ifError(err);
 96
 97      /**
 98       * Population
 99       */
100
101      BlogPost
102      .find({ tags: 'fun' })
103      .lean()
104      .populate('author')
105      .exec(function(err, docs) {
106        assert.ifError(err);
107
108        /**
109         * Populate the populated documents
110         */
111
112        var opts = {
113          path: 'author.friends',
114          select: 'name',
115          options: { limit: 2 }
116        }
117
118        BlogPost.populate(docs, opts, function(err, docs) {
119          assert.ifError(err);
120          console.log('populated');
121          var s = require('util').inspect(docs, { depth: null })
122          console.log(s);
123          done();
124        })
125      })
126    })
127  })
128});
129
130function done(err) {
131  if (err) console.error(err.stack);
132  mongoose.connection.db.dropDatabase(function() {
133    mongoose.connection.close();
134  });
135}