[PEAK] QueryDM's with no query params
psucorp at grinchcentral.com
Fri May 20 22:52:49 EDT 2005
>> and I can't even figure out what it's finding to iterate over. (I
>> can't find any __iter__() calls or anything.)
> Python will iterate over anything with a __getitem__.
Ah. I'm still learning to find my way around the Python documentation.
> This would be simplest:
> def __iter__(self):
> for item in self:
> yield item
Ah, so that is the best one can do. Thanks. I had done almost the same
thing, saving a generator, I think...
...and I stuck it in a ParamlessQueryDM class that I mixed into my
parameterless QueryDM's. I still wonder why it was iterating forever.
Maybe that belies a deeper bug someplace; I may take a look when
> And perhaps QueryDM should get a default __iter__ that raises
A good idea, IMO. That would at least save people like me a few
minutes, if by no other means than the comments above such a stub.
> , and __iter__ can then also be overridden (by DM's that wish to do
> so) to iterate over all their contents. This, in conjunction with the
> 'add' and 'remove' stubs, would move a few steps towards making
> today's DM's look like tomorrow's "workspaces".
Sounds like a good effort/reward ratio to me. I do want to thank you
for continuing to answer questions about this existing stuff, even as
you forge new frontiers in peak.query. :-)
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