Answers for "Q in django model"

django reverse queryset

queryset = reversed(Collection.objects.filter(pk__in = li))

django q objects

from django.db.models import Q

obj, created = Person.objects.filter(
    Q(first_name='Bob') | Q(first_name='Robert'),
).get_or_create(last_name='Marley', defaults={'first_name': 'Bob'})