This explains how to do this using the dictsort and regroup filters.
http://blueflavor.com/blog/2008/jul/28/advanced-django-template-tags-and-filters/
On Aug 30, 3:19 pm, Jonathan <kellenb...@gmail.com> wrote:
> I am looking for the exact same thing.
>
> On Aug 6, 11:35 pm, bweiss <weissmanbia...@gmail.com> wrote:
>
> > Is there a simple way to do the following that I'm just not seeing, or
> > am I looking at trying to write a custom tag? The functionality I
> > need is similar to {% regroup %} but not quite the same...
>
> > My app currently has a custom admin view in which I've defined a whole
> > bunch of different lists, which are all objects of the same model,
> > filtered according to different options of a field called "Type".
> > (eg. type_A_list = mymodel.objects.filter(Type="A"); type_B_list =
> > mymodel.objects.filter(Type="B"); etc.)
>
> > I've realised that the number of database hits this involves is
> > inefficient, and it would be cleaner to have a single list of objects
> > and try to perform the logic I need at the template level.
>
> > What I'd like to be able to do is, for a single variable,
> > "object_list", define subsets of this list containing objects that
> > meet a certain condition. So, to filter by the field "Type", I could
> > define lists called "type_A_list", "type_B_list", etc, that could be
> > iterated through in the same way as the original list.
>
> > The reason I need to do this is to be able to use the {% if
> > type_A_list %} tag in order to flag when there are NO objects of a
> > given type. This is why (as far as I can see) the {% regroup %} tag
> > won't quite work, as it only lists the groups that actually have
> > members.
>
> > Output would look something like:
>
> > Type 1:
> > Object 1, Object 5, Object 6
>
> > Type 2:
> > There are no objects of Type 2
>
> > Type 3:
> > Object 2, Object 4
>
> > Does anyone have any suggestions?
>
> > Thanks,
> > Bianca
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