Get articles from TYPO3 news extension - typo3

Question

I want to realize an image slide, that show the last 3 news from the news extension on it.
So - I'm obvioulsy new to TYPO3 - I somehow need to fetch the data from the news extension.
I would prefer doing it inside the new extension, so I guess - from what I know so far - it should look somehow like this
$objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
$orderRepository = $objectManager->get('Tx_News_Extension_Path_To_Articles'); // don't know path
$articles = $orderRepository->find(3, BY-DATE, DESC); // don't know the command
$this->view->assign('articles', $articles);
I head of another way by doing it through TypoScript. Maybe I could use this:
lib.news_list < lib.news
lib.news_list {
action = list
switchableControllerActions.News.1 = list
}
Would be glad to get some advise.
Chris

Answer 1

One option is to add a function like this to your repository:
public function findLastByDate($amount){
$query = $this->createQuery();
$query->setLimit($amount);
$query->setOrderings(array(
'date' => \TYPO3\CMS\Extbase\Persistence\Generic\QueryInterface::ORDER_DESCENDING
));
return $query->execute();
}
And call it in your controller:
$articles = $this->orderRepository->findLastByDate(3);