Laravel-admin 实现一个分组求和的数据展现

    protected function totalGrid()
    {
        $grid = new Grid(new MerchantStatistic);
        $grid->model()->groupBy('merchant_id')->select([DB::raw("sum(count) as total"),'merchant_id']);
        $grid->merchant_id('商户名')->display(function ($value) {
            return $this->merchant->name ;
        });

        return $grid;
    }

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