I had been hunting around for some way to do negation in queries, and
found QNot, though it is undocumented and not exported with Q. I
though this was a little bit clumsy, so here's a patch to add unary
negation to Q objects:
Index: django/db/models/query.py
===================================================================
--- django/db/models/query.py (revision 3656)
+++ django/db/models/query.py (working copy)
@@ -618,6 +618,9 @@
def __or__(self, other):
return QOr(self, other)
+ def __neg__(self):
+ return QNot(self)
+
def get_sql(self, opts):
return parse_lookup(self.kwargs.items(), opts)
Eventually I found .exclude() which should do what I want for some
cases, but I think for more complex queriers (i.e. where you don't
want to negate the entire expression), I think it is a little cleaner
to write -Q () instead of QNot(), especially if QNot is buried. Then
again, it may be buried deliberately.
`-`would not be my first choice for something that does logical
negation, but it seems like it's either that or `~` (__invert__,
bit-wise negation operator).
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