public function deleteChildren(int $parentID, int $postTypeID)
    {
        $this->categoryList = self::where("postTypeID", $postTypeID)->get();
        $this->getAllChildren($parentID);
        foreach($this->categoriesToBeDeleted as $cat){
            // Post type should not be able to be deleted if it has posts
            if(self::isInMenuLinks($cat->categoryID)) {
                return $this->response("You can't delete this Category because it is part of a menu.", 403);
            }

            $postType = PostType::findByID($postTypeID);
            // delete relations
            DB::table($postType->slug.'_categories')->where("categoryID", $cat->categoryID)->delete();
            // delete children
            $cat->delete();
        }
    }