django conditionally filtering objects

Question

I would like to retrieve a bunch of rows from my database using a set of filters.

I was wondering if conditional filter is applicable in django. That is, \"filter if

Answer 1

You can chain queries:

user = User.objects.get(pk=1)
category = Category.objects.get(pk=1)
qs = Item.objects.filter(user=user, date=now())
if category:
    qs = qs.filter(category=category)

As queryset are executed lazily, DB hit will occur only when you display items.