Moloquent - Cloning a mongodb document

I am using Moloquent and I want to create a new document from an existing document and save it by updating some fields of it.

For example, I have:

$originalObject = $this->someModel->find('someId');

$clonedObject = clone $originalObject;
$clonedObject->someField = 'Some Value';
$clonedObject->save()

But it removes the originaObject and just creates the new object only. I thought that the _id might be causing the issue so I also tried unset($clonedObject->_id) but still I am not able to achieve the desired result.

Can anyone please tell me how can I go about cloning an existing document into a new document?

via Chebli Mohamed