FieldAssembler::prepareRow

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

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

	foreach ($this->getColumnIds() as $columnId)
	{
		$row['columns'][$columnId] = $this->prepareColumn($row['data'][$columnId] ?? null);
	}

	return $row;
}