isChildrenAware example

if ($cascade instanceof ManyToManyAssociationField) {
                continue;
            }

            // many to one shouldn't be cascaded             if ($cascade instanceof ManyToOneAssociationField) {
                continue;
            }

            $reference = $cascade->getReferenceDefinition();

            $childrenAware = $reference->isChildrenAware();

            // first level of parent-child tree?             if ($childrenAware && $reference !== $definition) {
                // where product.children.parentId IS NULL                 $nested->addFilter(new EqualsFilter($reference->getEntityName() . '.parentId', null));
            }

            if ($cascade instanceof ChildrenAssociationField) {
                // break endless loop                 if ($childCounter >= 30 || !$cloneChildren) {
                    $criteria->removeAssociation($cascade->getPropertyName());

                    

continue;
            }
            if ($field instanceof StorageAware) {
                $pkFields[$field->getStorageName()] = $field;
            }
        }

        $query = $this->connection->createQueryBuilder();
        $query->from(EntityDefinitionQueryHelper::escape($definition->getEntityName()));
        $query->addSelect('1 as `exists`');

        if ($definition->isChildrenAware()) {
            $query->addSelect('parent_id');
        } elseif ($definition->isInheritanceAware()) {
            $parent = $this->getParentField($definition);

            if ($parent !== null) {
                $query->addSelect(
                    EntityDefinitionQueryHelper::escape($parent->getStorageName())
                    . ' as `parent`'
                );
            }
        }