/**
* @param Request $request
* @param CategoryInterface|null $selectNode
*
* @return array|ArrayCollection
*/
protected function getChildrenCategories(Request $request, $selectNode)
{
$parent = $this->findCategory($request->get('id'));
if (null !== $selectNode) {
$categories = $this->categoryRepository->getChildrenTreeByParentId($parent->getId(), $selectNode->getId());
} else {
$categories = $this->categoryRepository->getChildrenByParentId($parent->getId());
}
return $categories;
}