In article <mailman.3167.1362951587.2939.python-l...@python.org>,
Terry Reedy <tjre...@udel.edu> wrote:
> > It turns out, we don't actually use QuerySet in our models. We've
> > defined our own QuerySet subclass which adds a few convenience methods.
> > Adding
> >
> > def __len__(self):
> > raise NotImplemented
> >
> > to our subclass should do the job. It looks like list() respects that,
> > calls __iter__(), and does the right thing. I can't find any place
> > where that behavior for list() is documented,
>
> It is a cpython implementation detail that probably has changed with the
> versions.
Yeah, that's what I was afraid of. The "obvious" solution of:
class QuerySet(mongoengine.queryset.QuerySet):
def __init__(self, document, collection):
super(QuerySet, self).__init__(document, collection)
[...]
del self.__len__
results in:
[rest of stack dump elided]
del self.__len__
AttributeError: __len__
which I don't understand.
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