code: private function generate($class, array $names, $defaultCode)
      {
          /** @var \Ekyna\Component\Resource\Doctrine\ORM\ResourceRepositoryInterface $repository */
          $repository = $this->manager->getRepository($class);
  
          foreach ($names as $code => $name) {
              $result = 'already exists';
              if (null === $repository->findOneBy(['code' => $code])) {
                  /** @var CountryInterface|CurrencyInterface $entity */
                  $entity = $repository->createNew();
                  $entity
                      ->setName($name)
                      ->setCode($code)
                      ->setEnabled($defaultCode === $code);
  
                  $this->manager->persist($entity);
  
                  $result = 'done';
              }
              call_user_func($this->log, $name, $result);
          }
  
          $this->manager->flush();
      }
docs: Generates the entities.
  
  @param string $class
  @param array  $names
  @param string $defaultCode