/**
* Return the primary key of the Link Model if it has been persisted.
*
* @return array|null Primary key or Null if the Linked Model has not been persisted.
*/
public function getId()
{
// The given id consists of the ids of the referenced linked models,
// but there is no evidence that the LinkModel itself has been persisted yet.
// We so have to validate, if the LinkModel is persistent or still transient.
if (true === $this->isNewRecord()) {
// its a new record, so return null
return null;
}
// its not a new record, so we can hand over to the parent method
return parent::getId();
}
