On Fri, Sep 12, 2008 at 2:36 AM, Lance F. Squire <[EMAIL PROTECTED]> wrote:
>
> Currently using Django version 0.96.3, on a Fedora 8 system.
>
> I've currently set-up models for 'Manufacturer' and 'System'. System
> has a Foreignkey to Manufacturer.
>
> I'd like to display a list like so:
>
> Manu A
> System a
> System b
> System c
>
> Manu B
> System a
> System b
> System c
>
> Etc...
>
> Only listing Manufacturers that had systems of type X.
>
> I was thinking of using code like this in the View,
>
> man=Manufacturer.objects.all()
>>>> for m in man:
> ... sys=System.objects.filter(manufacturer=m.id)
> ... print m.name
> ... for s in sys:
> ... print " %s" % s.name
> ...
>
> This works from the shell, but I'm unsure how to get the output to the
> template And, I suspect is a terribly inefficient way to do it anyway.
Sounds like you're looking for something like the following:
{% for m in man %}
{{ m.name }}
{% for s in m.sys_set.all %}
{{ s.name }}
{% endfor %}
{% endfor %}
(plus some formatting bits, but they should be pretty obvious). This
assumes that "man" is in your context, and contains a list of
manufacturers (Manufacturer.objects.all(), for instance). The only
piece of this puzzle that might be a little confusing is
'm.sys_set.all'. m.sys_set is Django's way of saying "get all the sys
objects that are related to the Manufacturer m". More details here:
http://docs.djangoproject.com/en/dev/topics/db/queries/#following-relationships-backward
Yours,
Russ Magee %-)
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