[Zope] reverse sort (with patch)

[Martijn Pieters]

At 18:27 12/05/99 , benjamin.ryzman@easynet.fr wrote:
>Hello from a new Zope user!
>
>I'm currently playing with the idea of implementing a sort of Slashdot 
>community in Zope. I've just started DTML scripting and External methods 
>but my experience with python is limited.
>
>I'd like to get a sequence of the DTML Documents in the current Folder 
>*reverse* sorted by an attribute. Is there an easier way to do it than to 
>write an External Method. I find it difficult to believe that the "in" tag 
>gets a "sort" attribute but not an "rsort". Also I cannot use the python 
>reverse() method in an expr since this method reverses in place (and thus 
>returns None).
>
>What I was going to do was:
><!--#in expr="objectValues('DTML Document').reverse()" sort=entered_date-->
>...
><!--#/in-->
>which doesn't work.

With the following patch applied to lib/python/DocumentTemplate/DT_in.py

406a407,408
 >
 >     reverse=None
413c415
<                           previous=1, next=1, expr='', sort='')
---
 >                           previous=1, next=1, expr='', sort='', reverse=1)
419a422,423
 >
 >         if has_key('reverse'): self.reverse=args['reverse']
484a489
 >         if self.reverse is not None: sequence.reverse()
635a641
 >         if self.reverse is not None: sequence.reverse()

This diff works on both Zope 1.10.2 and 1.11.0pr1

You can then use the following DTML:

><!--#in expr="objectValues('DTML Document')" sort=entered_date reverse-->
>...
><!--#/in-->

It basically adds a new attribute to the #in tag, called 'reverse'. If 
present, the sequence will be reversed, wether it is sorted or not. This 
way it is also usable on sequences that have been sorted already.


--
Martijn Pieters, Web Developer
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