> This sounds like it might do what I need... Care to share a code
> example?
>
>
> Greg
(Don't forget to reply to the list...)
The documentation for the groupby function is notoriously obscure, but
it's actually simple to use. It generates pairs where the first item
is the common key for a group, and the second item is another iterable
containing the list of members belonging to that group. So here,
queryset is a list of objects, being grouped by their
get_FOO_display() method. Note that queryset is already sorted by
'kind': groupby only groups, you have to sort beforehand. Also, the
second item returned is a custom iterable, if you want it as a list
you have to cast it explicitly.
groups = {}
for k, lst in itertools.groupby(queryset,key=lambda x:
x.get_kind_display()):
groups[k] = list(lst)
Itertools is lots of fun. Once I've got the dictionary, I use
itertools.cycle to split it into three roughly equal chunks for use as
three columns in the template:
columns = {}
for x in itertools.cycle(('left','center','right')):
try:
blocks.setdefault(x,[]).append(groups.popitem())
except KeyError:
break
This is probably going overboard, but it's fun...
Eric
On May 10, 2008, at 2:41 AM, gmacgregor wrote:
>
>
> On May 9, 2:37 pm, gmacgregor <[EMAIL PROTECTED]> wrote:
>> Something like it is being "considered" but nothing for
>> sure:http://code.djangoproject.com/ticket/3566
>
> Whoops, I lied: check out the (currently) last comment made by Russ M
> on the ticket page:
>
> "For the benefit of those that haven't heard - ORM aggregation support
> has been accepted as a 2008 Google Summer of Code project. Nicolas
> Lara will be doing the heavy lifting, I (Russell Keith-Magee) will be
> mentoring."
>
> Nice!
> >
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