"Manual rollback": is it neccsessary to set id after an insert if deleting?

I've got some of code that looks like:

 

$this->User->create();
if ($this->User->save($this->request->data)) {
  // ... do some other stuff

  $this->User->Profile->create();

  if $this->User->Profile->save($profile) {
    if ($this->Utils->sendEmail($email_to, $username, $id)) {

      $this->Session->setFlash(__('The account has been created.'));

What I want to do is delete the user and profile records if the sendEmail fails, sort of like doing a manual transaction rollback.

What I want to know is:  is it neccessary to set the id before calling delete?  e.g. do I need to use getLastInsertID() or will the value already be set:

 

$this->User->delete();

or:

$this->User->id = $this->User->getLastInsertID();
$this->User->delete();

Thanks.

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