Single nested schema update objects nonfunctional with mixed object and path

[btkostner]

I'll let the code do the talking. Here is a shortened version for testing:

var child = new mongoose.Schema({
  item2: {
    item3: String,
    item4: String,
  },
});

var parent = new mongoose.Schema({
  name: String,
  item1: child,
});

var Parent = mongoose.model('Parent', parent)

mongoose.connect('mongodb://localhost/tmp', function(err) {
  Promise.resolve(Parent.create({
    'name': 'The first of its kind',
  }))
  .then(function(doc) {
    return doc.update({
      'item1.item2': {
        'item3': 'Test1',
        'item4': 'Test2',
      },
    });
  })
  .then(function(data) {
    console.log(data) // { ok: 0, n: 0, nModified: 0 }
  })
});

If doc.update() is changed to something like below, then all goes according to plan.

    return doc.update({
      'item1.item2.item3': 'Test1',
      'item1.item2.item4': 'Test2',
    });

Node: v5.5.0
Mongo: 3.2.0
Mongoose: 4.3.7
Time to find issue: > 3 hours

[btkostner]

I realize that according to mongodb, you have to use dot notation for this, but it would be nice if mongoose would convert it to dot notation for you.