Dynamic Retrieval of Rules for Multilingual Fields

helpers.php

<?php

if (! function_exists('add_locales'))
{
    function generateRules4(array $translatedFieldRules): array
    {
        $locales = config('translatable.locales');
        $return = [];

        foreach($locales as $locale) {
            $return["$locale"] = ["required", "array"];

            foreach ($translatedFieldRules as $name => $rules)
                $return["$locale.$name"] = $rules;
        }

        return $return;
    }
}

result

array:10 [ // app/Http/Requests/Folder/StoreFolderRequest.php:21
  "az" => array:2 [
    0 => "required"
    1 => "array"
  ]
  "az.name" => array:3 [
    0 => "required"
    1 => "string"
    2 => "max:224"
  ]
  "az.surname" => array:3 [
    0 => "required"
    1 => "string"
    2 => "max:224"
  ]
  "en" => array:2 [
    0 => "required"
    1 => "array"
  ]
  "en.name" => array:3 [
    0 => "required"
    1 => "string"
    2 => "max:224"
  ]
  "en.surname" => array:3 [
    0 => "required"
    1 => "string"
    2 => "max:224"
  ]
  "ru" => array:2 [
    0 => "required"
    1 => "array"
  ]
  "ru.name" => array:3 [
    0 => "required"
    1 => "string"
    2 => "max:224"
  ]
  "ru.surname" => array:3 [
    0 => "required"
    1 => "string"
    2 => "max:224"
  ]
  "parent_id" => array:3 [
    0 => "required"
    1 => "int"
    2 => "exists:folders,id"
  ]
]

StoreFolderRequest.php

<?php

namespace App\Http\Requests\Folder;

use Illuminate\Foundation\Http\FormRequest;
use function PHPUnit\Framework\callback;

class StoreFolderRequest extends FormRequest
{
    public function rules(): array
    {
        $translatedFieldRules = generateRules4([
            'name' => ['required', 'string', 'max:224'],
            'surname' => ['required', 'string', 'max:224']
        ]);

        return array_merge($translatedFieldRules, [
            "parent_id" => ['required', 'int', 'exists:folders,id']
        ]);
    }

    public function authorize(): bool
    {
        return true;
    }
}

UpdateFolderRequest.php

<?php

namespace App\Http\Requests\Folder;

use Illuminate\Foundation\Http\FormRequest;

class UpdateFolderRequest extends FormRequest
{
    public function rules(): array
    {
        $translatedFieldRules = generateRules4([
            'name' => ['string', 'max:224'],
            'surname' => ['string', 'max:224']
        ]);

        return array_merge($translatedFieldRules, [
            "parent_id" => ['int', 'exists:folders,id']
        ]);
    }

    public function authorize(): bool
    {
        return true;
    }
}