createDocumentElements example

if (!$elementModel instanceof DocumentElement) {
                            $elementModel = new DocumentElement();
                            $elementModel->setDocument($model);
                        }

                        $elementModel->fromArray($element);
                        $elements->add($elementModel);
                    }
                    $data['elements'] = $elements;
                } else {
                    $data['elements'] = $this->createDocumentElements($model);
                }
                break;

            default:
                break;
        }

        $model->fromArray($data);

        try {
            $manager->persist($model);