bike-admin/app/Http/Resources/CardRidingResource.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class CardRidingResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        $model = $this->resource;
        $data = [
            'areas' => AreaResource::collection($this->whenLoaded('areaRidingCard'))
        ];

        return array_merge(parent::toArray($request),$data);
    }
}