在Laravel Nova的数据透视表上显示文件字段中的数据

use Illuminate\Database\Eloquent\Model;
use Laravel\Nova\Fields\File;

class User extends Model
{
    // ...

    public function fields(Request $request)
    {
        return [
            // ...

            File::make('Avatar'),

            // ...
        ];
    }

    // ...
}

use Laravel\Nova\Resource;
use Laravel\Nova\Fields\Text;

class UserPivot extends Resource
{
    // ...

    public function fields(Request $request)
    {
        return [
            // ...

            Text::make('Avatar', function () {
                return $this->avatar->url;
            })->withMeta(['displayUsing' => 'downloadLink']),

            // ...
        ];
    }

    // ...
}

use Laravel\Nova\Resource;
use Laravel\Nova\Fields\Text;

class UserPivot extends Resource
{
    // ...

    public function fields(Request $request)
    {
        return [
            // ...

            Text::make('Avatar')->displayUsing(function ($value) {
                return '<a href="' . $value->url . '">下载链接</a>';
            }),

            // ...
        ];
    }

    // ...
}