koel/app/Http/Resources/PodcastResource.php

<?php

namespace App\Http\Resources;

use App\Models\Podcast;
use App\Models\PodcastUserPivot;
use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class PodcastResource extends JsonResource
{
    public const JSON_STRUCTURE = [
        'type',
        'id',
        'url',
        'title',
        'image',
        'link',
        'description',
        'author',
    ];

    public function __construct(private readonly Podcast $podcast, private readonly bool $withSubscriptionData = true)
    {
        parent::__construct($this->podcast);
    }

    public static function collection($resource): PodcastResourceCollection
    {
        return PodcastResourceCollection::make($resource);
    }

    /** @inheritdoc */
    public function toArray(Request $request): array
    {
        $data = [
            'type' => 'podcast',
            'id' => $this->podcast->id,
            'url' => $this->podcast->url,
            'title' => $this->podcast->title,
            'image' => $this->podcast->image,
            'link' => $this->podcast->link,
            'description' => $this->podcast->description,
            'author' => $this->podcast->author,
        ];

        if ($this->withSubscriptionData) {
            /** @var User $user */
            $user = $request->user();

            /** @var PodcastUserPivot $pivot */
            $pivot = $this->podcast->subscribers->sole('id', $user->id)->pivot;
            $data['subscribed_at'] = $pivot->created_at;
            $data['state'] = $pivot->state->toArray();
        }

        return $data;
    }
}