shipping-portal/app/Http/Resources/PackingListBaseResource.php

<?php

namespace App\Http\Resources;


use App\Models\Order;
use Illuminate\Http\Resources\Json\JsonResource;

class PackingListBaseResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        //The Base
        $data = [
            'id' => $this->id,
            'claimant_id' => $this->claimant_id,
            'reference' => $this->reference,
            'status' => $this->status,
            'transport' => new TransportResource($this->transports()->first()),
            'type' => $this->type,
            'container' => new ContainerResource($this->containers->first()),
            $this->mergeWhen($this->owner instanceof Order, [
                'order' => New OrderResource($this->owner)
            ]),
        ];
        return $data;
    }
}