applicant-site/app/Http/Requests/admin/UpdateDocumentRequest.php

<?php

namespace App\Http\Requests\admin;

use Illuminate\Foundation\Http\FormRequest;

class UpdateDocumentRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    public function rules(): array
    {
        return [
            'name' => [
                'required',
                'string',
                'max:255',
                "unique:documents,name,{$this->document->id}",
            ],
            'position' => 'required|int|numeric|max:255',
            'description' => 'string|nullable',
            'admission_id' => 'required|int|numeric|max:1000',
        ];
    }
}