ldc-dam/app/Http/Requests/Bo/Ajax/UploadMediaFileRequest.php

<?php

namespace App\Http\Requests\Bo\Ajax;

use Illuminate\Foundation\Http\FormRequest;

class UploadMediaFileRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return boolean
     */
    public function authorize()
    {
        return auth()->check();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, mixed>
     */
    public function rules()
    {
        return [
            'media_id' => 'nullable|exists:media,id',
            'dossier_id' => 'sometimes|exists:dossiers,id'
        ];
    }
}