gh-2378 enable getters for properties defined with non-strict schemas; u...

[alabid]

See #2378 for more details. The tests in test/document.strict.test.js have been appropriately updated as well.
All tests (including new assert's pass.

[vkarpov15]

Well done.

[laggingreflex]

Is this solved, or pushed to npm? I'm using 3.8.23 and the issue is still present

Just checked, the changes in this PR's commit aren't in my /lib/document.js

PS: Even not in https://github.com/Automattic/mongoose/blob/3.8.x/lib/document.js#L62

[laggingreflex]

Also just found out that this doesn't solve all cases. Only values that are defined work. Any new properties created are still ignored.

var User = mongoose.model('users', new mongoose.Schema(
    {username: String} , {strict: false}
));

var user = new User({a: 'a'}); //=> a is defined

user.a = 'b'; //-> a was defined 
console.debug(user.get('a')); //=> 'b' (ok)

user.c = 'c'; //-> c was not defined
console.debug(user.get('c')); //=> undefined (not ok!)

:(. Not even sure if this is even implementable (maybe with proxy in ES6). Although would be perfect for a truly schema-less document