New "Element Group" element in News and Events: Field tl_content.pid does not seem to be related

[CMSworker]

Affected version(s)

5.3.7

Description

The error occured in my case with the "change language" extension installed (and was reported there), but I think maybe it is a problem in the Contao core, because there was already a similar problem a few years ago, caused by a loop and resolved by @ausi : #5014

Maybe the nesting functionality of the new "element group" elements is causing another loop in the Contao\Model->getRelated('pid') function?

Steps to reproduce:

• Contao 5.3.7 with NewsBundle and ChangeLanguage 3.6.5 installed
• Add a news archive
• Add a new news article
• Add a Element Group element (that was introduced with Contao 5.3)
• Try to edit the children of the Element Group -> error: "Field tl_content.pid does not seem to be related"

Stack trace:

Exception:
Field tl_content.pid does not seem to be related

  at [...]\vendor\contao\core-bundle\contao\library\Contao\Model.php:685
  at Contao\Model->getRelated('pid')
     ([...]\vendor\terminal42\contao-changelanguage\src\EventListener\BackendView\ParentChildViewListener.php:55)
  at Terminal42\ChangeLanguage\EventListener\BackendView\ParentChildViewListener->getCurrentPage()
     ([...]\vendor\terminal42\contao-changelanguage\src\EventListener\BackendView\AbstractViewListener.php:63)
  at Terminal42\ChangeLanguage\EventListener\BackendView\AbstractViewListener->onLoad(object(DC_Table))
     ([...]\vendor\terminal42\contao-changelanguage\src\EventListener\BackendView\AbstractViewListener.php:35)
  at Terminal42\ChangeLanguage\EventListener\BackendView\AbstractViewListener->Terminal42\ChangeLanguage\EventListener\BackendView\{closure}(object(DC_Table))
     ([...]\vendor\contao\core-bundle\contao\drivers\DC_Table.php:227)
  at Contao\DC_Table->__construct('tl_content', array('tables' => array('tl_news_archive', 'tl_news', 'tl_content'), 'table' => array('Contao\\CoreBundle\\Controller\\BackendCsvImportController', 'importTableWizardAction'), 'list' => array('Contao\\CoreBundle\\Controller\\BackendCsvImportController', 'importListWizardAction')))
     ([...]\vendor\contao\core-bundle\contao\classes\Backend.php:291)
  at Contao\Backend->getBackendModule('news', null)
     ([...]\vendor\contao\core-bundle\contao\controllers\BackendMain.php:144)
  at Contao\BackendMain->run()
     ([...]\vendor\contao\core-bundle\src\Controller\BackendController.php:44)
  at Contao\CoreBundle\Controller\BackendController->mainAction()
     ([...]\vendor\symfony\http-kernel\HttpKernel.php:181)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
     ([...]\vendor\symfony\http-kernel\HttpKernel.php:76)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
     ([...]\vendor\symfony\http-kernel\Kernel.php:197)
  at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
     ([...]\web\index.php:42)

Related:
terminal42/contao-changelanguage#245
terminal42/contao-changelanguage#247

[CMSworker]

This issue seems to be solved with the latest updates in the change_language extension.
Thank you @aschempp