/**
* Check for uniqueness by a set of criteria.
*
* @param EntityInterface $entity
* @param array $criteria Keys are fields to check, values are strings to
* check against. An entity may be passed as a value.
* @return bool
*/
public function isUnique(EntityInterface $entity, array $criteria)
{
$qb = $this->getEntityManager()->createQueryBuilder();
$qb->select('e.id')->from($this->getEntityClass(), 'e');
// Exclude the passed entity from the query if it has an persistent
// indentifier.
if ($entity->getId()) {
$qb->andWhere($qb->expr()->neq('e.id', $this->createNamedParameter($qb, $entity->getId())));
}
foreach ($criteria as $field => $value) {
$qb->andWhere($qb->expr()->eq("e.{$field}", $this->createNamedParameter($qb, $value)));
}
return null === $qb->getQuery()->getOneOrNullResult();
}