public function render()
    {
        $columns = $this->getGrid()->columns()->flatMap(function (Column $column) {
            $name = $column->getName();

            $total = ($display = Arr::get($this->columns, $name)) ? $this->total($name, $display) : '';

            return [$name => $total];
        })->toArray();

        return view('admin::grid.total-row', compact('columns'));
    }