TYPO3 preview image of inline records

Question

A tt_content custom content element (imageslider) has IRRE slides.

The slide record has a title and an image (filereference).

Is it possible to preview the image of the IRRE record?

The previewRenderer class seems to be oriented only on the page view.

typo3/sysext/backend/Classes/Form/Container/InlineRecordContainer.php shows a TCA setting for headerThumbnail

However this TCA doesn't produce the headerThumbnail.

'appearance' => [
    'headerThumbnail' => [
        'field' => 'image',
        'width' => '45',
        'height' => '45c',
    ],

So a userFunc or something is needed to retrieve the fileUid for field ? Or is there an easier solution possible?

Answer 1

Nice hint, that there should be custom thumbnails possible...

After diving a bit deeper in InlineRecordContainer , it seems to be clear, that this can't work (anymore?). There are (in v10/v11) the following lines:

// Renders a thumbnail for the header
if ($GLOBALS['TYPO3_CONF_VARS']['GFX']['thumbnails'] && !empty($inlineConfig['appearance']['headerThumbnail']['field'])) {
    $fieldValue = $rec[$inlineConfig['appearance']['headerThumbnail']['field']];
    $fileUid = $fieldValue[0]['uid'];

For the UID of the thumbnail, the first array entry in the given field is used. But when debugging $rec (= $data['databaseRow'] ), we see, it is just the raw record, which means a FAL-field will not be an array but only an integer that counts the relations...

IMO this is a bug. I have just reported it: https://forge.typo3.org/issues/96188