PreselectedCollection::add

public function add(PreselectedItem $preselectedItem)
{
	if ($this->has($preselectedItem))
	{
		return;
	}

	if (!isset($this->itemsByEntity[$preselectedItem->getEntityId()]))
	{
		$this->itemsByEntity[$preselectedItem->getEntityId()] = [];
	}

	$this->itemsByEntity[$preselectedItem->getEntityId()][$preselectedItem->getId()] = $preselectedItem;
	$this->items[] = $preselectedItem;
}