shipping-portal/app/Transformers/DeliveryPackingListTransformer.php

<?php

namespace App\Transformers;

use App\Models\PackingList;
use League\Fractal\Resource\Item;
use League\Fractal\TransformerAbstract;

class DeliveryPackingListTransformer extends TransformerAbstract
{
    /**
     * List of resources to automatically include
     *
     * @var array
     */
    protected $defaultIncludes = [
        'transport'
    ];

    /**
     * List of resources possible to include
     *
     * @var array
     */
    protected $availableIncludes = [
        //
    ];

    /**
     * A Fractal transformer.
     *
     * @return array
     */
    public function transform(PackingList $list): array
    {
        $package = $list->packages()->first();

        return [
            'id' => $list->id,
            'claimant_id' => $list->claimant_id,
            'reference' => $list->reference,
            'status' => $list->status,
            'type' => $package->type,
            'description' => $package->description,
            'weight' => (float)$package->weight,
            'quantity' => (float)$package->quantity,
        ];
    }

    /**
     * Include Transport
     *
     * @param PackingList $list
     * @return Item
     */
    public function includeTransport(PackingList $list): Item
    {
        return $this->item($list->transports()->first(), new TransportTransformer());
    }
}