[Zope-CMF] sorting lists...

[Antony Higgs]

Tres -> thanks, it works a treat!

I have been trying to make it possible to use this same function to alpha
sort different lists by different properties - not always by 'Title'.

--------------
##parameters=pType,alphaBy

objects = context.contentValues(filter={'portal_type':pType})

tried...
objects.sort( lambda x, y: cmp( x.alphaBy, y.alphaBy ) )

...and then...
objects.sort( lambda x, y: cmp( x[alphaBy], y[alphaBy] ) )

return objects
--------------

any thoughts anyone?


thanks

Antony


Tres Seaver wrote:

> On Fri, 2003-03-28 at 04:46, Antony Higgs wrote:
> > Hi
> >
> > Using contentValues() to return a list of content, I am left with the
> > following...
> >
> > [ <Document at /my_folder/doc_a_id>,
> > <Document at /my_folder/doc_b_id>,
> > <Document at /my_folder/doc_c_id> ]
> >
> > Is it possible to sort the list alphabetically on an attribute of each
> > Document. ie. on 'Title'?
> >
> > ...and if so, how?  ;-)
>
> The naive implementation would be:
>
>   objects = context.contentValues()
>   objects.sort( lambda x, y: cmp( x.Title(), y.Title() ) )
>   return objects
>
> For a really long list, you may want to create a "decorated"
> intermediate (see the Python Cookbook for rationale):
>
>   objects = [ ( x.Title(), x ) for x in context.contentValues() ]
>   objects.sort()  # tuples compare "lexicographically"
>   return [ x[1] for x in objects ]
>
> Tres.
> --
> ===============================================================
> Tres Seaver                                tseaver@zope.com
> Zope Corporation      "Zope Dealers"       http://www.zope.com
>
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--
--------------------------
Antony Higgs
Web Editor/Administrator
Creative Services
Oxford Brookes University
Oxford. OX3 OBR

t: +44 (0) 1865 484459
f: +44 (0) 1865 484456
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