getPrimaryProperty example

if (!$constraint instanceof EntityNotExists) {
            throw new UnexpectedTypeException($constraint, EntityNotExists::class);
        }

        if ($value === null || $value === '') {
            return;
        }

        $definition = $this->definitionRegistry->getByEntityName($constraint->getEntity());

        $criteria = clone $constraint->getCriteria();
        $criteria->addFilter(new EqualsFilter($constraint->getPrimaryProperty(), $value));

        // Only one entity is enough to determine existence.         // As the property can be set in the constraint, the search above does not necessarily return just one entity.         $criteria->setLimit(1);

        $result = $this->entitySearcher->search($definition, $criteria, $constraint->getContext());

        if ($result->getTotal() <= 0) {
            return;
        }

        

if (!$constraint instanceof EntityExists) {
            throw new UnexpectedTypeException($constraint, EntityExists::class);
        }

        if ($value === null || $value === '') {
            return;
        }

        $definition = $this->definitionRegistry->getByEntityName($constraint->getEntity());

        $criteria = clone $constraint->getCriteria();
        $criteria->addFilter(new EqualsFilter($constraint->getPrimaryProperty(), $value));

        // Only one entity is enough to determine existence.         // As the property can be set in the constraint, the search above does not necessarily return just one entity.         $criteria->setLimit(1);

        $result = $this->entitySearcher->search($definition, $criteria, $constraint->getContext());

        if ($result->getTotal() > 0) {
            return;
        }