chatbotbegriffe/Classes/Controller/CategoryController.php

<?php

namespace Meramo\Begriffmgt\Controller;

use Meramo\Begriffmgt\Domain\Model\Category;
use Meramo\Begriffmgt\Domain\Repository\CategoryRepository;
use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
use TYPO3\CMS\Extbase\Persistence\Generic\PersistenceManager;

class CategoryController extends ActionController
{
    public function __construct(CategoryRepository $categoryRepository) {
        $this->categoryRepository = $categoryRepository;
    }

    public function createAction(string $title) {
        $category = $this->categoryRepository->findByTitle($title);
        if(!$category){
            $category = new Category();
            $category->setTitle($title);
            $this->categoryRepository->add($category);
            $this->objectManager->get(PersistenceManager::class)->persistAll();
            $categoryUid = $category->getUid();
        } else {
            $categoryUid =$category['uid'];
        }
        return $categoryUid;
    }
}