tojsonWithVirtuals.js

var mongoose = require('./../../mongoose');
mongoose.connect('localhost', 'testing_tojsonWithVirtuals');

var schema = new mongoose.Schema({
    name: {
        first: String
      , last: String
    }
  , age: Number
});

schema.virtual('fullname').get(function () {
  return this.name.first + ' ' + this.name.last;
});

schema.virtual('name.silly').get(function () {
  return this.fullname + ' is silly';
});

schema.virtual('nested.thing').get(function () {
  return this.age + ' | ' + this.fullname;
});

// toJSON with virtuals
schema.methods.toJSON2 = function () {
  var json = this.toJSON();

  var schema = this.schema
    , virtuals = schema.virtuals
    , paths = Object.keys(virtuals)
    , i = paths.length
    , path

  while (i--) {
    path = paths[i];

    var parts = path.split('.')
      , plen = parts.length
      , last = plen - 1
      , branch = json
      , part

    for (var pp = 0; pp < plen; ++pp) {
      part = parts[pp];
      if (pp === last) {
        branch[part] = this.get(path);
      } else {
        branch = branch[part] || (branch[part] = {});
      }
    }
  }

  return json;
}

var A = mongoose.model('A', schema);

mongoose.connection.on('open', function () {
  A.create({ name: { first: 'tetris', last: 'party' }, age: 1 }, function (err, a) {
    if (err) return console.error(err.stack||err);

    A.findById(a, function (err, doc) {
      if (err) return console.error(err.stack||err);
      console.error(doc);

      console.error(doc.toJSON2());

      mongoose.connection.db.dropDatabase(function () {
        mongoose.connection.close();
      });
    });
  })
});