How to translate emails when sending them asynchronously with Symfony Messenger?

问题

I configured the Symfony mailer to send emails with messenger.

https://symfony.com/doc/current/mailer.html#sending-messages-async

I have my emails in two languages and I rely on the requests to detect the language, but now the emails are not translated.

How can I get the messages to be translated in the language detected in the request?

In my controller:

$mailer->send(
            $user->email,
            $this->translator->trans('mails.recover.subject'),
            'email/client/password-recovery.html.twig',
            compact('user', 'hash', 'target')
        );

Template:

{% extends 'email/base.html.twig' %}

{% block content %}
    <h2>{{ 'mails.recover.header' | trans({'%name%': user.name}) }}</h2>

    <p style="margin: 25px 0;">
        {{ 'mails.recover.text1' | trans({'%url%': url('default')}) | raw }}
    </p>

// More code

Messenger config:

framework:
    messenger:
        # Uncomment this (and the failed transport below) to send failed messages to this transport for later handling.
        # failure_transport: failed

        transports:
            # https://symfony.com/doc/current/messenger.html#transport-configuration
            async: '%env(MESSENGER_TRANSPORT_DSN)%'
            # failed: 'doctrine://default?queue_name=failed'
            # sync: 'sync://'

        routing:
            # Route your messages to the transports
            # 'App\Message\YourMessage': async
            'Symfony\Component\Mailer\Messenger\SendEmailMessage':  async

Looking better the subject of the mail if it is translated correctly, the body of the mail does not

If I remove the line

'Symfony\Component\Mailer\Messenger\SendEmailMessage':  async

in messegner config, translation work.

回答1:

The problem you have is that the Translator component gets the user's locale form the request, and when sending your mails asynchronously by the time the mail is actually sent the request is long finished and gone, the context is one of the message consumer and there is no request locale information.

There are two solutions for this:

First Option: You pass the values already translated to the template (which is what you are doing with the email subject).

E.g. something like this:

$mailer->send(
        $user->email,
        $this->translator->trans('mails.recover.subject'),
        'email/client/password-recovery.html.twig',
            [
                'user' => $user,
                'hash' => $hash,
                'target' => $target,
                'labels' => [
                  'header' => $this->translator
                                   ->trans('mails.recover.subject', [ 'name' => $user->getName()]),
                  'text1'  => $this->translator
                                    ->trans('mails.recover.text1', ['url', => $defaulUrl])
            ]
);

And then in your template you use the values directly:

{% extends 'email/base.html.twig' %}

{% block content %}
    <h2>{{ texts.header }}</h2>
    <p style="margin: 25px 0;">{{ texts.text1 }}</p>
{% endblock %}

This would be my preferred approach, since it makes the template as dumb as possible and easy to reuse in different contexts. The templates themselves do not need to know anything not pertaining the actual rendering of its content.

Second Option: Let the templating system know what user locale you want to translate to:

$mailer->send(
        $user->email,
        $this->translator->trans('mails.recover.subject'),
        'email/client/password-recovery.html.twig',
            [
                'user'   => $user,
                'hash'   => $hash,
                'target' => $target,
                'requestLocale' =>  $locale
                // get the locale from the request
                // (https://symfony.com/doc/current/translation/locale.html)
            ]
);

Then you use the received locale in the filter you are using, as described here:

<h2>{{ 'mails.recover.header' | trans({'%name%': user.name}, 'app', requestLocale) }}</h2>

---

While I prefer the first one, playing with either option should let you get your desired results.

回答2:

My solution wich works also for url_absolute in the twig.

$message = (new TemplatedEmail())
...

$renderer = new BodyRenderer($this->twig);
$renderer->render($message);
$this->mailer->send(new RawMessage($message->toString()),Envelope::create($message));

With Environment $twig and MailerInterface $mailer

回答3:

The "Second Option: Let the templating system know what user locale you want to translate to:" is the best solution as long as the email content requires no translations.

If you have complex emails with a lot of text a better approach is to work with multiple templates and let application set locale decide which email template must be used.

Or in the template email.

{% if language is defined %}
    {# Language still specified #}    
{% else %}
    {% set language = 'ne' %}
{% endif %}

{% if language == "en" %}
    <h1>Ticket for - <code>{{ activity.name }}</code> by participant <code>{{ buyer.name }}</code> </h1>
{% else %}
    <h1>Kaartje voor - <code>{{ activity.name }}</code> door deelnemer <code>{{ buyer.name }}</code> </h1>
{% endif %}

来源：https://stackoverflow.com/questions/62560730/how-to-translate-emails-when-sending-them-asynchronously-with-symfony-messenger