LaravelApp/app/Http/Resources/CommentResource.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class CommentResource extends JsonResource
{
    public function toArray(Request $request): array
    {
        return [
            'id' => $this->id,
            'submission_id' => $this->submission_id,
            'author' => $this->author,
            'content' => $this->content,
            'created_at' => $this->created_at->toISOString(),
            'updated_at' => $this->updated_at->toISOString(),
            
            'submission' => new SubmissionResource($this->whenLoaded('submission')),
            'attachments' => AttachmentResource::collection($this->whenLoaded('attachments')),
        ];
    }
}