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Symfony 4 / Sonata: managing a multilingual administration interface

We will see how to set up a multilingual admin interface with a language selection button (language switcher).Installing translationBundle composer require sonata-project/translation-bundle bin/console assets:install The language switcher requires a specif...

Written by Thomas Bourdin 2 min read
Symfony 4 / Sonata: managing a multilingual administration interface

We will see how to set up a multilingual admin interface with a language selection button (language switcher).

Installing translationBundle

composer require sonata-project/translation-bundle

bin/console assets:install

The language switcher requires a specific twig filter.
Otherwise, you will get an error like:

Unknown "language_name" filter.

Then, you need to install these two bundles

composer require twig/intl-extra
composer require twig/extra-bundle
bin/console cache:clear

We add the default configuration

# config/packages/sonata_translation.yaml

sonata_translation:
    locales: [en, fr, it, nl, es]
    default_locale: en
    # change default behavior for translated field filtering.
    default_filter_mode: gedmo # must be either 'gedmo' or 'knplabs', default: gedmo
    # here enable the types you need
    gedmo:
        enabled: true
    knplabs:
        enabled: true
    #phpcr:
    #    enabled: true

And we include styles in the admin

# config/packages/sonata_admin.yaml

sonata_admin:
    assets:
        extra_stylesheets:
            - bundles/sonatatranslation/css/sonata-translation.css

We override the display of the sonata template

# config/packages/sonata_admin.yaml

sonata_admin:
    templates:
        layout: '@SonataTranslation/standard_layout.html.twig'

We add the routes

# config/routes.yaml

sonata_translation:
    resource: '@SonataTranslationBundle/Resources/config/routes.yaml'

And we enable the language switcher 

# config/packages/sonata_translation.yaml

sonata_translation:
    locale_switcher: true

And the last point to avoid the error 

Argument 5 passed to Twig\Extra\Intl\IntlExtension::formatDateTime() must be of the type string, null given,



You will have to load the twig/extra-bundle before SonataIntlBundle so that sonataIntl's formatDateTime function overrides the one from TwigExtraBundle.

This gives us:

    Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle::class => ['all' => true],
    Twig\Extra\TwigExtraBundle\TwigExtraBundle::class => ['all' => true],
    Sonata\IntlBundle\SonataIntlBundle::class => ['all' => true],
    Sonata\TranslationBundle\SonataTranslationBundle::class => ['all' => true],
Sélection_413

Adapt the example to the installed version

The Symfony and Sonata examples remain tied to the versions indicated in the article. Symfony 4.x and Symfony 6.2 are no longer maintained: for a current project, use a maintained branch and the documentation that exactly matches your dependencies.

php bin/console about
composer show symfony/framework-bundle sonata-project/admin-bundle

Before resuming the code, check the signatures, services, routes, and templates concerned. Then add a functional test covering permissions, HTTP code, and the visible result.

Reference: maintained Symfony versions.

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