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On Dec 5, 2011, at 1:39 PM, Daniel Nouri wrote:
>
> Thanks for your explanation. I haven't used hybrid a lot yet and this
> helped me understand what it does and what not.
>
> Your last example that uses a 'with_transformation', i.e. a protocol
> that I guess would amount to allowing to run the query through an
> arbitrary function, is quite nice to read, and I'd definitely be a
> user. Then again, there's nice enough alternatives for what I'm
> trying to do, so I'll be fine without. :-)
OK, well with_transformation is literally:
def with_transformation(self, fn):
return fn(self)
so there's not much controversy there. I've added it and wrote up an example
of how to combine this with a hybrid comparator, to produce two approaches for
your problem (which just makes a nice example). It looks *interesting*, but I
don't know how much this pattern would catch on - if it's one of those patterns
that can keep expanding out or not. Check it out at:
http://www.sqlalchemy.org/docs/orm/extensions/hybrid.html#building-transformers
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