Why doesn't Django Paginate paginate objects for DetailView with MultipleObjectMixin?

Question

Django

Good afternoon!

There was a need to make pagination for DetailView in Django. Googling, I found out that this can be done using MultipleObjectMixin. The result is this:

views.py

class BuyDetailView(DetailView, MultipleObjectMixin):
model = CarsBuy
template_name = 'cars/cars_buy_detail.html'
slug_field = 'cars_buy_url'
paginate_by = 10

def get_context_data(self, **kwargs):
    object_list = Cars.objects.filter(cars_buy=self.get_object())
    context = super(BuyDetailView, self).get_context_data(object_list=object_list, **kwargs)
    return context

models.py

class CarsBuy(models.Model):
    cars_buy = models.CharField("Купить", max_length=50, unique=True)

class Cars(models.Model):
    cars_buy = models.ManyToManyField(CarsBuy, verbose_name="Купить", blank=True, related_name='cars_buy_rn')

Pagination is showing up. But instead of paginating objects, each pagination page displays the full list of objects in the same way. Tell me, please, what could be the problem?