Filter a django QuerySet with the query from another QuerySet: Possible?

Question

Say I create a QuerySet like:

q0  = Thing.objects.all()
fq0 = q0.filter(x=y)

at time t0. Then I add some new things to Thing db. These things form the QuerySet:

q1 = Thing.objects.filter(created_gt=t0)

I want to generate the QuerySet:

fq = (q0 | q1).filter(x=y)

Without having to know what x or y are. In other words, i'd like to be able to do something like this:

fq1 = q1.filter(query=fq0.query)
fq = fq0 | fq1

Is this possible? Manually setting

q1.query = fq0.query

merely sets q1 == fq0. I've seen some people asking about extracting the sql from a queryset, but this won't really help me.

Answer 1

How about something along these lines:

Thing.objects.filter(field__in=Another_Thing.object.filter())

Django will do query and subquery.

Answer 2

Many year after I found a solution.

You can use the __dict__ prop from you queryset. For instance:

o = Model.objects.filter(arg=param)
o2 = Model.objects.all()
o2.query.__dict__ = o.query.__dict__
o2.filter(arg2=param2)

o2 will now is filtered by arg and arg2!

I used this to pass a ModelChoiceField filter to django-jet autocomplete views (fork at https://github.com/paulorsbrito/django-jet).

Hope this helps someone in trouble.