2FAuth/app/Api/v1/Requests/GroupStoreRequest.php

<?php

namespace App\Api\v1\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Auth;
use Illuminate\Validation\Rule;

class GroupStoreRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return Auth::check();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'name' => [
                'required',
                'string',
                'max:32',
                Rule::unique('groups')->where(fn ($query) => $query->where('user_id', $this->user()->id)),
            ],
        ];
    }
}