Validation not working on undefined model properties

Hey,

Not sure if this is working as intended or not, but I noticed that if I instantiate a model then immediately save it, the validation rules on the individual properties are not run.

I created a small script below to demonstrate what I mean. If you run this with mocha, the first test on the user model will fail because err is null after the save, when I was expecting the validation to fail because user.email == undefined.

var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    should = require('should'),
    UserSchema,
    User;

mongoose.connect('mongodb://localhost/test');

function validatePresenceOf (value) {
    if(typeof value === 'string' || typeof value === 'number') {
        value = value.toString().trim();
    }
    return !!(value && value.length);
}

UserSchema = new Schema({
    email : {type: String, 
        validate: [validatePresenceOf, "email required"],
        index: {unique: true}
    },
    hashed_password : String,
    salt : String
});

User = mongoose.model('User', UserSchema);

describe('validatePresenceOf', function () {
    it("should return false for undefined", function () {
        validatePresenceOf(undefined).should.be.false;
    });

    it("should return false for empty string", function () {
        validatePresenceOf('').should.be.false;
    })
})

describe("User model", function () {
    describe("validation", function () {
        afterEach(function () {
            User.find().remove();
        });

        it(" does not validate if user.email is not set first", function (done) {
            var user = new User();

            // expecting validation to fail because validatePresenceOf returns
            // false, but err is null
            user.save(function (err) {
                should.exist(err);
                err.toString().should.equal('ValidationError: Validator ' + 
                    '"email required" failed for path email');
                done();
            });
        });

        it("is fine if I set user.email", function (done) {
            var user = new User();
            user.email = '';

            // validation works fine if I set user.email before saving
            user.save(function (err) {
                should.exist(err);
                err.toString().should.equal('ValidationError: Validator ' + 
                    '"email required" failed for path email');
                done();
            });
        });
    });
});

[jonstorer]

There should not need to be a trick to make it work.

[successivesoftware]

use default: null worked for me.