How to set ObjectId to null or remove ObjectId

[Rob Hicks]

I have a schema that includes a field that is set to ObjectId. The field is set to the id of the document's parent. The document is not embedded in the parent. And, the field is not required.

I want to remove the parent in some cases so the document is at the root of hierarchy. Unfortunately, doing so results in a "Cast toObjectId failed ..." error.

What is the proper way to set the ObjectId to null or to remove the ObjectId?

I have tried to set the parent to undefined.

schema.method('removeParent', function(parentId, cb){

        var self = this;

        var err = null;

        if(parentId){

            self.parent = undefined;

            self.path = self.path.replace(parentId + pathSeparator, '');

        } else {

            err = 'parent ID required';

        }

        return cb(err, self);

    });

[Jason Crawford]

In my app I am able to set an ObjectId property to undefined and save it, no problem. Maybe it has something to do with your schema?

-Jason

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[Stefano Pongelli]

Not sure if it helps but I noticed that setting ObjectId to undefined and then saving works, while trying something like: model.update({ _id: id }, { prop: undefined }, cb)  

fails.

Cheers

Stefano