On Wed, Aug 20, 2008 at 11:17 PM, Benjamin Buch <[EMAIL PROTECTED]> wrote:
>
>
> Hi Garret,
>
> > How about sending the template something like:
> >
> > songs = Recording.objects.filter(represents_song=True)
> >
> > A custom manager seems like overkill for this situation (If I'm
> > understanding you right).
> >
> > - Garrett
>
> this is indeed a plausible sollution.
> I then had to access the songs' data via the recording in the template
> like
>
> {% for recording in songs %}
> {{ recording.song.title }}
> {{ recording.song.description }}
> {{ recording.mp3 }}
> {% endfor %}
>
> For my special case I think this should work, because every song has
> exact one recording that represents it.
> And you are right, a custom manager seems like overkill in this case.
> But out of interest, it turned out to be a more general question for me:
>
> How to limit the query set of a related object?
>
> I think this can only be done via a custom manager...
>
> Thanks!
>
> -benjamin
>
Benjamin,
I'm not sure i understand you question. You can filter via the attributes
of a related object like this:
Recording.objects.filter(song__artist="Ben Folds")
For more on the filter tag, go here:
http://www.djangoproject.com/documentation/db-api/#filter-kwargs
As I understand it, a custom manager is just a convenience to abstract out
commonly used filter patterns. This means that there is nothing that "can
only be done via a custom manager" that can't also be done directly to a
queryset. (Please someone correct me if I'm wrong.)
For more on custom managers, read this:
http://www.djangoproject.com/documentation/models/custom_managers/
- Garrett
>
> >
>
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