Controller::addAction

public function addAction(): ?array
{
	$entityId = $this->forward($this, self::ADD_INTERNAL_ACTION);
	if ($this->getCriticalErrors())
	{
		return null;
	}

	$this->setSourceParametersList(array_merge(
		[
			[
				'entityId' => $entityId,
				'copy' => false,
			],
		],
		$this->getSourceParametersList(),
	));

	return [
		'entityId' => $entityId,
		'load' => $this->createLoadResponse(),
		'title' => $this->getEntityTitle(),
		'header' => $this->getEntityHeader(),
	];
}