Django output slice using order_by('?')[:n]?

Question

Django

Instead of 5 I want to put the variable n

answers = Answer.objects.all().order_by('?')
answers = answers[:5]

n I take from the database. How to do what you want? Answer base, take everything, mix, take the first n and send to html

Answer 1

n = guestionNum.objects.all()
n=n[0].question_num

Answer 2

def example_view(request, n):
    answers = Answer.objects.all().order_by('?')[:n]
    context = {'answers': answers}
    return render(request, 'template.html', context)

Need to consider order_by('?') very slow query