876.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
mongoose.connect('localhost', 'testing_876');
mongoose.connection.on('error', function () {
  console.error(arguments);
});

var schema = new Schema({
    name: String
  , active : {type:Boolean, default: false }
});

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

mongoose.connection.on('open', function () {
  var a = new A({ name: '876' });
  a.save(function (err, a) {
    if (err) return console.error(err.stack||err);

    // confirm the data in the db by skipping mongoose
    //A.collection.findOne({ _id: a._id }, function (err, doc) {
    //  console.error(doc);
    //});

    A.findOne({ _id: a._id }, ['name','active'], function (err, doc) {
      if (err) console.error(err);
      console.error(doc.active);
      mongoose.connection.close();
    });
  })
});