order_by('?') means django code example

Example 1: django order by

Entry.objects.filter(pub_date__year=2005).order_by('-pub_date', 'headline')

Example 2: pass in queryset as filter django

users = UserClasses.objects.filter(class_id=data['class_id'])
user_details = User.objects.filter(id__in=users.values_list('id', flat=True))