How to connect to an existing mongo collection in Symfony?

Question

symfony

There is an already existing database. It is necessary to implement the frontend on Symfony. There is an option using an additional class, but I wanted to organize it natively.
But how - I can not understand.
Can someone point my finger at the docstring or share their experience?

Answer 1

https://symfony.com/doc/current/doctrine/multiple_...
Everything is easier than it seems...

$connection = $this->getDoctrine()->getManager('mongodb')->getConnection();

Answer 2

Why native? and why the class is additional?