If I have two querysets, say 'a' and 'b', the goal is to create another
queryset, say 'c', which has all elements in 'a' that is not in 'b'.
I can write:
c = a.exclude(id__in=b.values('id'))
but this seems a little tedious, why can't I just write:
c = a.exclude(b)
is there any way to do similar?
(note: things like `set(a) - set(b)` is not acceptable because it
produces a python set, not a django queryset)
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