shipping-portal/app/Transformers/PackageTransformer.php

<?php

namespace App\Transformers;

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

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

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

    /**
     * A Fractal transformer.
     *
     * @param Package $package
     * @return array
     */
    public function transform(Package $package): array
    {
        return [
            'id' => $package->id,
            'type' => $package->type,
            'description' => $package->description,
            'width' => floatval($package->width),
            'height' => floatval($package->height),
            'length' => floatval($package->length),
            'weight' => $package->weight,
            'quantity' => $package->quantity,
            'cbm' => (($package->width / 100) * ($package->height / 100) * ($package->length / 100)) * $package->quantity,
            'reference' => $package->packingList->reference,
            'status' => $package->status,
        ];
    }

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

    /**
     * Include Container
     * @param Package $package
     * @return Item
     */
    public function includeContainers(Package $package): Item
    {
        return $this->item($package->packingList->containers()->first(), new TransportTransformer());
    }

    /**
     * Include Order
     * @param Package $package
     * @return Item
     */
    public function includeOrder(Package $package): Item
    {
        return $this->item($package->packingList->owner, new OrderTransformer());
    }
}