public function getInverseCriteria(EntityMetadata $owner, EntityMetadata $related, $identifiers, $inverseField)
    {
        $criteria = [
            $inverseField   => (array) $identifiers,
        ];
        if (true === $related->isChildEntity()) {
            // The relationship is owned by a polymorphic model. Must include the type in the root criteria.
            $criteria[Persister::POLYMORPHIC_KEY] = $related->type;
        }
        return $criteria;
    }