course-site/app/Repositories/Transformers/Exam/PaperTransformer.php

<?php

namespace App\Repositories\Transformers\Exam;

use Carbon\Carbon;
use League\Fractal\TransformerAbstract;
use App\Repositories\Models\Exam\Paper;

/**
 * Class PaperTransformer.
 *
 * @package namespace App\Repositories\Transformers\Exam;
 */
class PaperTransformer extends TransformerAbstract
{
    /**
     * Transform the Paper entity.
     *
     * @param \App\Repositories\Models\Exam\Paper $model
     *
     * @return array
     */
    public function transform(Paper $model)
    {
        return [
            'id' => (int)$model->id,
            'name' => $model->name,
            'topics' => $model->topics,
            'created_at' => $model->created_at->format(Carbon::DEFAULT_TO_STRING_FORMAT),
            'updated_at' => $model->updated_at->format(Carbon::DEFAULT_TO_STRING_FORMAT)
        ];
    }
}