Is there a fundamental difference between injecting a Repository into a function and getting it through the entityManager (see code)?

Question

symfony

The data can be obtained like this:

public function list(ItemRepository $itemRepository)
    {
        $items = $itemRepository->findAll();

or so

public function list()
    {
        $entityManager = $this->getDoctrine()->getManager();
       $items = $entityManager->getRepository(Item::class)->findAll();

Is there any fundamental difference between these two approaches?

What exactly is the advantage of DI (the first option) in this situation? And does it exist at all?

Thank you.

Answer 1

If you just need to get some data from the repository, then the first option is better.
But if you need to somehow change the received data, then the second option is better, because. you can immediately pull persist and flush from em.

Answer 2

Try writing tests for this class/method and see what the difference is.