nestedvalidation.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var assert = require('assert')
mongoose.connect('localhost', 'testing_findone');

var schema = new Schema({
  name: { last: { type: String, required: true} }
});

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

mongoose.connection.on('open', function () {
  A.findOne({}, ['name'], function (err, doc) {
    if (err) console.error(err.stack||err);
    assert.equal(null, doc);
    console.error('all good');

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

I suppose declared name as an object doesn't consider selected fields and still returns empty objects, which will then cause validation errors while #save ....

A.findOne({}, ['nick'], function (err, doc) { is working on the 2.x and master branch now. I'm still working on some issues for 2.x before releasing.

nice, so you could reproduce the issue :)

will test it on my huge model with lots of usecases ...

nice!

This is my next issue, custom validation functions are still called on fields which are not selected.

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var assert = require('assert')
mongoose.connect('localhost', 'testing_findone');
var schema = new Schema({
  name: {
    type: String,
    required: true,
    validate: [function(str) {
        return str.length < 20;
    }, 'MaxLength']
  },
  nick: {
    type: String,
    required: true
  },
  soemthing: String
}, {strict: true});

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

mongoose.connection.on('open', function () {
  var a = new A({
    name: 'name',
    nick: 'nick'
  });
  a.save(function(err) {
    assert.equal(null, err);

    A.findOne({},['nick'], function (err, doc) {
      if (err) console.error(err.stack||err);
      console.log('"name" in doc should be false but it is - ', 'name' in doc);

      doc.nick = 'blubb';
      doc.save(function(err) {
        console.error(err);
        mongoose.connection.db.dropDatabase(function () {
          mongoose.connection.close();
        });
      });
    });

  });
});

please open a ticket on the repo. :)