Adding new checkbox field to tx_news_domain_model_media - typo3

Question

I am trying to add a new checkbox field 'showinhome' to the table 'tx_news_domain_model_media' same to the field 'showinpreview' here is my TCA Configuration in Configuration/TCA/Overrides/tx_news_domain_model_media.php
$temporaryColumns = [
'showinhome' => [
'exclude' => 1,
'label' => 'Show in Home',
'config' => [
'type' => 'check',
'default' => 0,
],
],
];
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns(
'tx_news_domain_model_media',
$temporaryColumns
);
$GLOBALS['TCA']['tx_news_domain_model_media']['ctrl']['label_alt'] .= ', showinhome';
$GLOBALS['TCA']['tx_news_domain_model_media']['interface']['showRecordFieldList'] .= ', showinhome';
$GLOBALS['TCA']['tx_news_domain_model_media']['palettes']['newsPalette']['showitem'] .= 'showinhome,';
The field is not displayed, can someone help me please?

Answer 1

You have mixed up some stuff here.
First: tx_news can use either the own media model or the native FAL relations. I personally always use the native FAL relation.
If you want to add this field to the media table, then there is no newsPalette there. You can use the below code to add the new field:
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('tx_news_domain_model_media', $temporaryColumns);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCAtypes('tx_news_domain_model_media', implode(',', array_keys($temporaryColumns)));
If you using the normal FAL relation then the showinpreview field is added to the sys_file_reference table's TCA configuration and not to the tx_news_domain_model_media table.
If you want to add this field to the file, then you need to add it to the sys_file_reference field the same way tx_news does it (I guess that you already copied the code from it's override file)
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('sys_file_reference', $temporaryColumns);
// add special news palette
$GLOBALS['TCA']['sys_file_reference']['palettes']['newsPalette']['showitem'] .= ', showinhome';
Last but not least: you have to specify tx_news as a dependency in your extension, otherwise TYPO3 does not know that your extension has to be loaded after tx_news. If you change the dependency after you installed your extension you probably need to uninstall and install it again in the extension manager.