/**
* Add the field to the relation and set the sort order
* @see UploadField::encodeFileAttributes()
*/
protected function encodeFileAttributes(File $file)
{
$attributes = parent::encodeFileAttributes($file);
$sortField = $this->getSortColumn();
$record = $this->getRecord();
$relationName = $this->getName();
if ($record && $relationName && ($list = $record->{$relationName}())) {
if ($record->many_many($relationName) !== null) {
$list->add($file, array($sortField => $list->count() + 1));
}
}
return $attributes;
}
