I've searched the Symfony/Doctrine documentation, as well as this
forum and Google, but was unable to find an answer.

The Symfony manual says: "The ORM is smart enough to detect
relationships between objects, so saving the $article object also
saves the related $comment object. "

How deep does this transitivity go?

eg.

Reservation hasMany Room hasMany Guest

Is there a way to save a Reservation, and it's several Rooms, each
with several Guests, all in a single $reservation->save();?

I am working with another framework where the transitivity is limited
to two levels. So it would save a reservation with it's rooms, but
you'd need to manually loop through and save all guests yourself.

Would love to hear that Symfony/Doctrine supports this in a single
method call.... does it?

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