MultipleFieldAssembler::prepareRow

protected function prepareRow(array $row): array
{
	$columnIds = $this->getColumnIds();
	if (empty($columnIds))
	{
		return $row;
	}

	$row['columns'] ??= [];

	foreach ($columnIds as $columnId)
	{
		$value = $this->getFlatColumnValues($row['data'][$columnId] ?? null);
		if (is_array($value))
		{
			$value = join(' / ', $value);
		}
		$value = MainTextHtmlFilter::encode((string)$value);

		$row['columns'][$columnId] ??= $value;
		$row['data']['~' . $columnId] ??= $value;
	}

	return $row;
}