CityRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

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

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules(): array
    {
        switch ($this->method()) {
            case "POST": {
                return [
                    "name" => "required|min:2|max:100|unique:cities",
                ];
            }
            case "PUT": {
                return [
                    "name" => "required|min:2|max:100|unique:cities,name," . $this->route('city'),
                ];
            }
        }
        return [];
    }
}