Enum validation issue in subdocuments

[tusbar]

Hey,

var mongoose = require('mongoose'); // mongoose@4.2.3

var s = new mongoose.Schema({
    array: [
        {
            string: {
                type: String,
                enum: [
                    'foo',
                    'bar',
                    'baz'
                ]
            }
        }
    ]
});

var Cool = mongoose.model('Cool', s);

it('should fail', function (done) {
    mongoose.connect('localhost/cool', function () {
        var cool = new Cool();
        var entry = cool.array.create({
            string: 'hello?'
        });
        cool.array.push(entry);

        cool.save(function (err) {
            expect(err).to.be.ok;
            done();
        });
    });
});

The enum validation is not performed, and the string property is saved with garbage value.
Not sure if related to #3511, since validation works if I use a required instead of the enum.

[vkarpov15]

Fix will be in 4.2.5, thanks for the repro, that was very helpful 🍻.

In the future, I'd recommend avoiding using .create(), it's unnecessary, you can just pass a POJO to .push() and get the same result.