Thank you Daniel and Florian (Merci beaucoup. Je parle francais un
petit).
I think that I will be able to use both templates and custom model
methods to accomplish what I am trying.
On Apr 5, 4:18 pm, Daniel Roseman <roseman.dan...@googlemail.com>
wrote:
> On Apr 5, 8:49 pm, codecowboy <guy.ja...@gmail.com> wrote:
>
>
>
> > I posted a question earlier today about circular imports (http://
> > groups.google.com/group/django-users/t/6119e979131c8c25). I now have
> > a follow question to that. I've got the following view logic.
>
> > def portal(request):
> > scientist_id = 1
> > s = get_object_or_404(Scientist, pk=scientist_id)
> > return render_to_response('scientists/portal.html',
> > {'scientist':s})
>
> > Now, Scientists are related (many-to-many) to Conferences through
> > ConferenceAttendee. Both of these models are created in a different
> > app. I won't paste them in unless someone needs to see them in order
> > to answer my question.
>
> > I only want to loop through conferences that this scientist is
> > presenting. (ConferenceAttendee.presenter=True). I have tried
> > following the docs (http://docs.djangoproject.com/en/dev/topics/db/
> > queries/#field-lookups-intro), but it seems that you can only call the
> > filter method in python files like views.py or models.py. I've tried
> > replacing the loop code below with "for ...conference._set.filter(...)
> > but python gives me errors when I do that. Here is my template logic.
>
> > <h2>Your Presentations</h2>
>
> > <ul>
> > {% for conference in scientist.conference_set.all %}
> > <li><a href="/conferences/{{ conference.id }}">
> > {{ conference.title }}</a><a href=""><img src="/site_media/images/
> > portal_start_button.jpeg" /></a></li>
> > {% endfor %}
>
> > </ul>
>
> > I've been stuck on this one for days now so any help would be greatly
> > appreciated. Please do point me to any articles that I may have
> > missed that already answer this post.
>
> > Thank you,
>
> > Guy
>
> The issue is that in a template, you can't call any method or function
> that requires an argument. There are two ways of dealing with this:
> create a custom template tag or filter, or create a method that
> doesn't need arguments.
>
> In this case, I'd go with the second option. Just create a method on
> the Scientist model that returns a queryset of conferences at which
> they are a presenter.
>
> class Scientist(models.Model):
> .... blah ....
>
> def presenting_conferences(self):
> return self.conferences_set.filter(presenter=True)
> #or whatever the filter is
>
> and in the template:
>
> {% for conference in scientists.presenting_conferences %}
> etc.
> --
> DR.
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