On Thu, 2006-10-19 at 09:18 +0000, zenx wrote:
> Hi,
> I have a templatetag that returns a lists of objects. The problem is I
> want to include another information for every object: I want to include
> the number of related objects for every object of a ManyToMany
> relationship. The model ArtistaTag has a ManyToMany relationship with
> Artistas. So I use:
>
> tags=['']
> nums=['']
> q = ArtistaTag.objects.all()
>
> for tag in q:
> num = tag.artista_set.count()
> if num >= 1:
> tags.append(tag)
> nums.append(num)
> context['lista_tags'] = tags
> context['nums'] = nums
> return ''
>
> So that I become 2 lists, one with the objects (tags) and the other
> with the number of related objects (nums) but I don't know if this is
> the right way to do that an more important: I don't know how to get the
> number of every object in each object iteration in my template:
>
> {% for tag in lista_tags %}
> {{ tag.name }}
> how to get the num for this tag?
>
> I don't know if you understand me, please send any comments and I will
> try to clarify my problem.
One way to achieve the effect you are after is to put the extra
information in as an attribute on the Tag objects. So instead of
nums.append(num), you would do
tag.num = num
Then, in your template, accessing tag.num will give you the value you
are after. This is, in fact, exactly the example given in the Django
documentation
(http://www.djangoproject.com/documentation/model_api/#adding-extra-manager-methods
) -- adding counts to an object.
Regards,
Malcolm
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