How to get language specific path in twig?

Question

In a twig template you are able to get a relative path by using {{ path('entity.node.edit_form', {'node': nid }) }}. The path will be in current language.

Now I need to get the path in a specfic language. I thought I could use {{ path('entity.node.edit_form', {'node': nid }, {'language': langcode}) }} but this results an error if I set langcode to a string like DE. According to the api docs language has to be a language object. How can I accomplish this in twig?

Answer 1

For a twig only solution you can define a custom twig function path_lang(), which adds the language object to options, if a language code is provided as additional parameter:

src/TwigExtension.php:

<?php

namespace Drupal\mymodule;

use Drupal\Core\Language\LanguageManagerInterface;
use Drupal\Core\Routing\UrlGeneratorInterface;

class TwigExtension extends \Twig_Extension {

  protected $languageManager;

  protected $urlGenerator;

  public function __construct(LanguageManagerInterface $language_manager, UrlGeneratorInterface $url_generator) {
    $this->languageManager = $language_manager;
    $this->urlGenerator = $url_generator;
  }

  public function getName() {
    return 'mymodule';
  }

  public function getFunctions() {
    return [
      new \Twig_SimpleFunction('path_lang', [$this, 'getPathLang']),
    ];
  }

  public function getPathLang($name, $parameters = [], $options = [], $langcode = '') {
    if (!empty($langcode)) {
      if ($language = $this->languageManager->getLanguage($langcode)) {
        $options['language'] = $language;
      }
    }
    return $this->urlGenerator->generateFromRoute($name, $parameters, $options);
  }
}

mymodule.services.yml:

services:
  mymodule.twig.extension:
    arguments: ['@language_manager', '@url_generator']
    class: Drupal\mymodule\TwigExtension
    tags:
      - { name: twig.extension }

In twig:

{{  path_lang('entity.node.edit_form', {'node': nid }, {}, 'en') }}

Answer 2

This won't work because I think that you need the language object and not only the langcode.

The best way to do this I think it's to do it in a THEME_preprocess_node in your yourtheme.theme file :

SOLUTION 1 (get translation of the node and then get the proper link) :

function yourtheme_preprocess_node(&$vars) {
    $node = &$vars['node'];
    // TO HAVE NODE URL IN ANY OF YOUR NODE TEMPLATES FOR CURRENT LANGUAGE
    $vars['node_url'] = $node->toUrl()->toString();
    // SOLUTION 1
    $node_de = $node->getTranslation('de');
    if ($node_de && is_object($node_de)) {
        $node_url = $node_de->toUrl()->toString();
        $vars['node_url_de'] = $node_url;
    }
}

SOLUTION 2 (get the url object of the node and then get translation of the url object) :

function yourtheme_preprocess_node(&$vars) {
    $node = &$vars['node'];
    // TO HAVE NODE URL IN ANY OF YOUR NODE TEMPLATES FOR CURRENT LANGUAGE
    $vars['node_url'] = $node->toUrl()->toString();
    // SOLUTION 2
    $language_manager = \Drupal::service('language_manager');
    $language_de = $language_manager->getLanguage('de');
    $urlNodeObject = $node->toUrl();
    $urlNodeObject->setOption('language', $language_de);
    // IF YOU WANT AN ABSOLUTE URL
    $urlNodeObject->setAbsolute();

    $vars['node_url_de'] = $urlNodeObject->toString();
}

Although I put $vars['node_url'] = $node->toUrl()->toString(); to print {{ node_url }} instead of {{ path('entity.node.edit_form', {'node': nid }) }} because I think it's better.

Then in your TWIG template you just have to print {{ node_url_de }} for your aliased german node link.