public function save($descriptions = null, $categories = null)
    {
        if ($this->attached()) {
            $name = $this->name;
            $this->memory->put("acl_{$name}", [
                'acl'          => $this->acl,
                'actions'      => $this->actions->get(),
                'roles'        => $this->roles->get(),
                'descriptions' => $descriptions,
                'categories'   => $categories
            ]);
        }
        return $this;
    }