private function findExistingCategory(Category $category, $parentCategory)
    {
        $existingCategory = $this->categoryRepository->findOneBy([
            'name' => $category->getName(),
            'parentId' => $parentCategory,
        ]);

        if (null === $existingCategory) {
            return null;
        }

        return $existingCategory->getId();
    }
private function findExistingCategory(Category $category, $parentCategory)
    {
        $existingCategory = $this->categoryRepository->findOneBy([
            'name' => $category->getName(),
            'parentId' => $parentCategory,
        ]);

        if (null === $existingCategory) {
            return null;
        }

        return $existingCategory->getId();
    }
@param Category $category
@param int      $parentCategory

@return null|int