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

<?php

namespace App\Http\Requests\admin;

use Illuminate\Foundation\Http\FormRequest;

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

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