c5.7.X install custom file attribute via package controller

Permalink February 10, 2017 at 10:14 AM

Hi

I need help in installing a file attribute via package controller. My script:

$att = AttributeType::getByHandle('textarea');
      $myAttribute = CollectionAttributeKey::getByHandle('description_long');
      if(!is_object($myAttribute)){
         CollectionAttributeKey::add($att, array(
            'akHandle' => 'description_long',
            'akName' => t('Beschreibung lange Version'),
            'akIsSearchable' => true,
            'akTextareaDisplayMode' => 'rich_text',
               'akCategoryID' => 3
         ), $pkg);
      }

The controller installs the attribute but it is now under page attributes located.
What is the right way to set it as file attribute? Maybe somebody can help?

Greets
Marcus