code: public function getChildren($name)
      {
          $query = (new Query())
              ->select(['name', 'type', 'description', 'rule_name', 'data', 'created_at', 'updated_at'])
              ->from([$this->itemTable, $this->itemChildTable])
              ->where(['parent' => $name, 'name' => new Expression('[[child]]')]);
  
          $children = [];
          foreach ($query->all($this->db) as $row) {
              $children[$row['name']] = $this->populateItem($row);
          }
  
          return $children;
      }
docs: {@inheritdoc}