/**
     * 展示某一个资源的操作记录
     * @param $item 需要展示历史记录的resource
     * @return KPanel 以panel形式返回操作记录
     */
    public static function adminHistoryPanel($item)
    {
        $panel = new KPanel(KPanel::STYLE_WARNING);
        $panel->title('历史操作记录');
        $panel->collapse();
        $table = new KTable();
        $table->th('发生时间')->functional(function (HistoryModel $record) {
            return e($record->created_at);
        })->th('操作者')->functional(function (HistoryModel $record) {
            $operator = $record->operator;
            if ($operator) {
                return e($operator->username);
            } else {
                return '匿名操作';
            }
        })->th('涉及表格')->functional(function (HistoryModel $record) {
            return e($record->table . '.' . $record->resource_id);
        })->th('动作')->functional(function (HistoryModel $record) {
            return e($record->action);
        })->th('旧数据')->functional(function (HistoryModel $record) {
            $records = HistoryModel::unserialize($record->old);
            $html = '';
            foreach ($records as $key => $val) {
                $key = json_encode($key);
                $val = json_encode($val);
                $html .= <<<HTML
<span class="label label-warning">{$key}:{$val}</span>
HTML;
                return $html;
            }
        })->th('新数据')->functional(function (HistoryModel $record) {
            $records = HistoryModel::unserialize($record->new);
            $html = '';
            foreach ($records as $key => $val) {
                $key = e($key);
                $val = e($val);
                $html .= <<<HTML
<span class="label label-success">{$key}:{$val}</span>
HTML;
                return $html;
            }
        });
        $table->itemsToTbody($item->histories);
        $panel->content($table);
        return $panel;
    }
 public function restored($model)
 {
     $operator = $this->operator();
     HistoryModel::recordRestoreAction($operator, $model);
     return $model;
 }