undefined not valid in update query

[hartbit]

I could be wrong but undefined is valid to trigger a $unset in this scenario:

doc.path = undefined;
doc.save();

but not inside a query:

Model.findOneAndUpdate({}, { path: undefined }, callback);

It throws this exception:

CastError: Cast to string failed for value "undefined"

For me, that's a bug. I expected it to work.

[aheckmann]

Just updated the docs with findAndModfiy details this morning: http://mongoosejs.com/docs/api.html#model_Model-findOneAndUpdate

This behaves the same as with model.update, nothing but casting of the values is applied. if you need $unset,

Model.findOneAndUpdate({}, { $unset: { path: 1 }}, callback);

[bitmage]

Aaron - are you saying this behavior is resulting from code in the native driver? I agree with @hartdev, removing undefined values should be handled at the ODM or driver level. If you feel it's the responsibility of the native driver I can pursue it there.