On Sep 16, 2:30 am, "Lance F. Squire" <[EMAIL PROTECTED]> wrote:
> On Sep 15, 5:21 pm, Daniel Roseman <[EMAIL PROTECTED]>
> wrote:
>
> > Probably the easiest solution, if you know you're
> > always going to be requesting a certain lookup, is to define a custom
> > method on the model:
>
> > class System(models.Model):
> > ... field declarations ...
>
> > def get_header_pic(self):
> > return
> > self.system_pictures.filter(image_category__name='Header_Pic')
>
> > and then in the template you can just do {{ info.get_header_pic }}
>
> As there can be 20 or more images associated with a system, This is
> more what I was looking for. Thanks!!!
>
> However, I can't seem to get this to work.
>
> Here are the new lines in System:
>
> def get_header_pic(self):
> return
> self.system_pictures.filter(image_category__name='Header_Pic')
>
> def get_header_logo(self):
> return
> self.system_pictures.filter(image_category__name='Header_Logo')
>
> I put them just above the Class Admin: line.
>
> Here is the new lines in the template:
>
> <IMG src="{{ info.get_header_pic.location }}"
> width="{{ info.get_header_pic.width }}"
> height="{{ info.get_header_pic.height }}" border="0"
> name="{{ info.get_header_pic.name }}">
>
> <IMG src="{{ info.get_header_logo.location }}"
> width="{{ info.get_header_logo.width }}"
> height="{{ info.get_header_logo.height }}" border="0"
> name="{{ info.get_header_logo.name }}">
>
> Lance
Sorry, my mistake. filter() always gives you a queryset - because
there might be more than one instance of the related model that fits
the criteria - so you can't jut reference the location/width directly.
The best way is to do something like this:
try:
return
self.system_pictures.filter(image_category__name='Header_Pic')[0]
except IndexError:
pass
which will always get the first related image in that category, and
silently swallows the error that's thrown if there's no such picture.
By the way, I would recommend playing around in the shell (./manage.py
shell) with this - you'll get a much better feel for how it all fits
together.
-
DR.
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