/**
  * Get grouped categories
  * @return \Magefan\Blog\Model\ResourceModel\Category\Collection
  */
 public function getGroupedChilds()
 {
     $k = 'grouped_childs';
     if (!$this->hasDat($k)) {
         $array = $this->_categoryCollection->addActiveFilter()->addStoreFilter($this->_storeManager->getStore()->getId())->setOrder('position')->getTreeOrderedArray();
         $this->setData($k, $array);
     }
     return $this->getData($k);
 }