How to override translator in symfony 5.2 - symfony

Question

I'm trying to override translator class in Symfony 5.2. I tried this:
# config/services.yaml
services:
# ....
App\Translator:
decorates: translator
and this (App\Translator implements TranslatorInterface):
# config/services.yaml
services:
# ....
App\Translator:
arguments:
$translator: '#translator'
Symfony\Contracts\Translation\TranslatorInterface: '#App\Translator'
both methods work well in PHP code, but in development mode in the twig, translator service is still DataCollectorTranslator. So in twig templates the translator service remains not overridden. How can I fix it?

Answer 1

It's possible I am not understanding the question. If something works in one mode but not another then sometimes just deleting the var/cache directory and building a new cache with bin/console cache:clear might work.
Decorating services can be a bit interesting sometimes. I created a fresh 5.2 project and then added:
# src/Translation/Translation.php
namespace App\Translation;
use JetBrains\PhpStorm\Pure;
use Symfony\Component\Translation\MessageCatalogueInterface;
use Symfony\Component\Translation\TranslatorBagInterface;
use Symfony\Contracts\Translation\LocaleAwareInterface;
use Symfony\Contracts\Translation\TranslatorInterface;
use Symfony\Bundle\FrameworkBundle\Translation\Translator as BaseTranslator;
class Translator implements TranslatorInterface, TranslatorBagInterface, LocaleAwareInterface
{
// Uses PHP8 constructor promotion
public function __construct(private BaseTranslator $translator)
{
}
#[Pure]
public function trans(string $id, array $parameters = [], string $domain = null, string $locale = null): string
{
//return $this->translator->trans($id,$parameters,$domain,$locale);
return strtoupper($id); // Verify calling this class
}
public function getCatalogue(string $locale = null): MessageCatalogueInterface
{
return $this->translator->getCatalogue($locale);
}
#[Pure]
public function getLocale(): string
{
return $this->translator->getLocale();
}
public function setLocale(string $locale)
{
$this->translator->setLocale($locale);
}
}
# config/services.yaml
services:
_defaults:
autowire: true
autoconfigure: true
App\Translation\Translator:
decorates: translator
# index.html.twig
<li>{{ 'Hello' | trans }}</li>
You can disregard the Pure stuff as well as some of the PHP8 stuff. I was using this as a PHP8 test as well.
But it all seems to work as advertised.