async def METHOD_NAME(self):
    tournament = await Tournament.create(name="tournament")
    await Event.create(name="First", tournament=tournament)
    await Event.create(name="Second", tournament=tournament)
    tournament_with_filtered = (
        await Tournament.all()
        .prefetch_related(Prefetch("events", queryset=Event.filter(name="First")))
        .first()
    )
    tournament = await Tournament.first().prefetch_related("events")
    self.assertEqual(len(tournament_with_filtered.events), 1)
    self.assertEqual(len(tournament.events), 2)