Nextras\Orm\Mapper\Dbal\DbalMapper::createRelationshipMapper PHP Метод

    protected function createRelationshipMapper($type, PropertyMetadata $metadata, IMapper $otherMapper = null)
    {
        switch ($type) {
            case Relationship::MANY_HAS_ONE:
                return new RelationshipMapperManyHasOne($this->connection, $this, $metadata);
            case Relationship::ONE_HAS_ONE:
                return new RelationshipMapperOneHasOne($this->connection, $this, $metadata);
            case Relationship::MANY_HAS_MANY:
                return new RelationshipMapperManyHasMany($this->connection, $this, $otherMapper, $metadata);
            case Relationship::ONE_HAS_MANY:
                return new RelationshipMapperOneHasMany($this->connection, $this, $metadata);
            default:
                throw new InvalidArgumentException();
        }
    }