gistfile1.txt

// must use `doc.set` for all changes

noschemahack.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var assert = require('assert')

console.log('\n===========');
console.log('    mongoose version: %s', mongoose.version);
console.log('========\n\n');

mongoose.connect('localhost', 'testing_noschema');
mongoose.connection.on('error', function () {
  console.error('connection error', arguments);
});

var schema = new Schema({
}, { _id: false, id: false, strict: false });

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

mongoose.set('debug', true);
mongoose.connection.on('open', function () {
  var a = new A({ name: 'noschema' });

  a.save(function (err, a) {
    if (err) return done(err);

    A.findOne(function (err, doc) {
      console.error('found', doc);

      doc.set('anything', 'sdf');
      doc.save(function (err) {
        assert.ifError(err);

        A.findOne(function (err, doc) {
          assert.ifError(err);
          console.error('found', doc);

          doc.set('anything', undefined);
          doc.save(function (err) {
            assert.ifError(err);
            A.findOne(function (err, doc) {
              assert.ifError(err);
              console.error('found', doc);
              done();
            })
          })
        });
      });
    });
  })
});

function done (err) {
  if (err) console.error(err.stack);
  mongoose.connection.db.dropDatabase(function () {
    mongoose.connection.close();
  });
}