Argument 1 passed to `formatShowData` must be of the type array, string given

[fritzmg]

If you have a custom element like this:

return [
    'label' => ['Foobar', ''],
    'types' => ['content'],
    'contentCategory' => 'texts',
    'standardFields' => ['cssID'],
    'wrapper' => ['type' => 'none'],
    'fields' => [
        'elements' => [
            'label' => ['Elements'],
            'elementLabel' => '%s. element',
            'inputType' => 'list',
            'minItems' => 1,
            'fields' => [
                'number' => [
                    'label' => ['Number', 'Lorem ipsum.'],
                    'inputType' => 'text',
                    'eval' => ['tl_class' => 'clr w50', 'size' => 3, 'multiple' => true, 'maxlength' => 255],
                ],
                'text' => [
                    'label' => ['Text', 'Dolor sit amet.'],
                    'inputType' => 'text',
                    'eval' => ['rte' => 'tinyMCE', 'tl_class' => 'clr'],
                ],
            ],
        ],
    ],
];

and you create a content element with it, the following error will occur when clicking ℹ️

TypeError:
Argument 1 passed to MadeYourDay\RockSolidCustomElements\CustomElements::formatShowData() must be of the type array, string given, called in vendor\madeyourday\contao-rocksolid-custom-elements\src\CustomElements.php on line 193

  at vendor\madeyourday\contao-rocksolid-custom-elements\src\CustomElements.php:180
  at MadeYourDay\RockSolidCustomElements\CustomElements::formatShowData('20', array(), '1. element › number 1 › ', 'elements[0]->number[0]->')
     (vendor\madeyourday\contao-rocksolid-custom-elements\src\CustomElements.php:193)
  at MadeYourDay\RockSolidCustomElements\CustomElements::formatShowData(array('number' => array('20'), 'text' => 'Test'), …
     (vendor\madeyourday\contao-rocksolid-custom-elements\src\CustomElements.php:193)
  at MadeYourDay\RockSolidCustomElements\CustomElements::formatShowData(…
     (vendor\madeyourday\contao-rocksolid-custom-elements\src\CustomElements.php:175)
  at MadeYourDay\RockSolidCustomElements\CustomElements::onshowCallback(…
     (vendor\contao\core-bundle\src\Resources\contao\drivers\DC_Table.php:552)
  at Contao\DC_Table->show()
     (vendor\contao\core-bundle\src\Resources\contao\classes\Backend.php:642)
  at Contao\Backend->getBackendModule('article', null)
     (vendor\contao\core-bundle\src\Resources\contao\controllers\BackendMain.php:169)
  at Contao\BackendMain->run()
     (vendor\contao\core-bundle\src\Controller\BackendController.php:48)
  at Contao\CoreBundle\Controller\BackendController->mainAction()
     (vendor\symfony\http-kernel\HttpKernel.php:159)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
     (vendor\symfony\http-kernel\HttpKernel.php:81)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
     (vendor\symfony\http-kernel\Kernel.php:201)
  at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
     (web\index.php:31)        

I think it's the text input field with 'multiple' => 3 that causes this, though haven't looked into it in more detail yet.

[ausi]

I was not able to reproduce that. Your stack trace shows the data as
array('number' => array('20'), 'text' => 'Test')
but It should have been something like
array('number' => 'a:1:{i:0;s:2:"20";}', 'text' => 'Test')
instead.

[ausi]

@fritzmg Should we keep this open?