custom registration in laravel

I have changed the default unsigned integer id of User table to uuid or char(36). For it to automatically generate Uuid during saving of new user, I have changed the register function in RegistersUsers trait to as -

 public function register(Request $request)
{
    $validator = $this->validator($request->all());

    if ($validator->fails()) {
        $this->throwValidationException(
            $request, $validator
        );
    }
    $inputsArray=$request->all();

    $inputsArray['id']=(string)Uuid::generate();
    //dd($inputsArray);
    Auth::guard($this->getGuard())->login($this->create($inputsArray));

    return redirect($this->redirectPath());
}

Finally, it saves the new user data but with blank id column. I thought the uuid is not generated but when I dumped $inputsArray there was id value with 36 chars. Help me understand this, to save the data with user id. Thanks.

via Chebli Mohamed