/**
  * Retrieve the persisted model for the given ACE.
  *
  * If none is given, null is returned.
  *
  * @param \Symfony\Component\Security\Acl\Model\EntryInterface $ace
  *
  * @return \Propel\Bundle\PropelAclBundle\Model\Acl\Entry|null
  */
 protected function getPersistedAce(EntryInterface $ace, ObjectIdentity $objectIdentity, $object = false)
 {
     if (null !== $ace->getId() and null !== ($entry = EntryQuery::create()->findPk($ace->getId(), $this->connection))) {
         $entry->reload(true, $this->connection);
         return $entry;
     }
     /*
      * The id is not set, but there may be an ACE in the database.
      *
      * This happens if the ACL has created new ACEs, but was not reloaded.
      * We try to retrieve one by the unique key.
      */
     $ukQuery = EntryQuery::create()->filterByAclClass($objectIdentity->getAclClass($this->connection))->filterBySecurityIdentity(SecurityIdentity::fromAclIdentity($ace->getSecurityIdentity(), $this->connection));
     if (true === $object) {
         $ukQuery->filterByObjectIdentity($objectIdentity);
     } else {
         $ukQuery->filterByObjectIdentityId(null, \Criteria::ISNULL);
     }
     if ($ace instanceof FieldEntryInterface) {
         $ukQuery->filterByFieldName($ace->getField());
     } else {
         $ukQuery->filterByFieldName(null, \Criteria::ISNULL);
     }
     return $ukQuery->findOne($this->connection);
 }