[Zope-dev] Functional programming

[Lalo Martins]

On Thu, Feb 24, 2000 at 11:04:19AM -0600, Tres Seaver wrote:
> Lalo volleys:
> > 
> > Not really. Practical example:
> > 
> > <dtml-in "map (Catalog.get_object, Catalog(...))">
> >    perform some operation, like listing the objects, without
> >    need to bload the Catalog with all properties in the objects
> > </dtml-in>
> 
> The downside here is that you activate every object found, which can be deadly
> for a really large result set.  The rationale for using meta_data is to allow
> presentation of a limited view of the catalogued objects without pulling them
> into memory from the ZODB.

I realize that, but it's pretty useful when I'm sure the set
will be small (by constraining the Catalog call, for example).
Come think of it, sometimes I don't _want_ a "limited" view,
and the set of properties I need is so big that loading the
meta_data would be more or less the same overhead as loading
the objects.


> > And even if I _should_ use Python, then it should at least be
> > supported in PythonMethods.
> 
> PythonMethods have no more access than DTML Methods/Documents (by design).

And this is correct, IMHO.


[]s,
                                               |alo
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