hi Rajesh
thanks, that's a great link.
still, it's not exactly clear to me why the admin does not work the same as
other templates.
in my own template, it is no problem to refer to comments of a post using,
e.g.
{% for comment in post.comments.all %}
[...]
{% endfor %}
or
{{ post.comments.all|length }}
looks inconsistent to me.
thanks & cheers
André
On Thu, Jul 17, 2008 at 4:14 PM, Rajesh Dhawan <[EMAIL PROTECTED]>
wrote:
>
>
>
> On Jul 17, 8:32 am, "Andre Meyer" <[EMAIL PROTECTED]> wrote:
> > hi all
> >
> > imagine you have a first model class and a second model class with a
> > ForeignKey referring to the first one. for example, a Post model (taken
> from
> > the tutorial blog app) and a Comment model. of course, a post can have
> > multiple comments, so the Post model gets an attribute 'comments'
> (specified
> > using related_name).
> >
> > how can the comments be displayed in the list view of the posts using
> > newforms-admin? i would like to indicate whether there are comments and
> how
> > many, if any.
>
> Create a method in your Post class like this:
>
> def comment_stats(self):
> return self.comments.count()
>
> Then add 'comment_stats' to the list_display of your Post's Admin
> options.
>
> >
> > but when adding the 'comments' attribute to the list_display of
> PostOptions,
> > syncdb throws an exception:
> >
> > *django.core.exceptions.ImproperlyConfigured:
> `PostOptions.list_display[13]`
> > refers to `comments` that is neither a field, method or property of model
> > `Post`.
> > *
> > which is not true! Post does get a 'comments' field by the definition of
> > Comment.
>
> From the Post's perspective comments is a multi-valued field. However,
> the Admin list_display of Post is intended to show one Post record per
> row. So displaying post.comments where comments can have a dozen rows
> per post doesn't make sense i.e. the Admin can't guess that you want
> to show just the presence of comments as a boolean flag or that you
> want to show the count of comments. The above technique of using a
> custom method is how you can accomplish what you want here.
>
> See:
>
> http://code.djangoproject.com/wiki/NewformsHOWTO#Q:HowdoIaddanextracolumntothechangelistview
>
> -Rajesh D
> >
>
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