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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