On Jan 12, 2008 5:28 AM, David Grant <[EMAIL PROTECTED]> wrote:
> I have a simple category model. They will eventually be chapters in a book
> and I only want entries to go into child categories, not the roots. Here's
> the models:
>
> class Category(models.Model):
> name = models.CharField (max_length=120, blank=True)
> parent = models.ForeignKey('self', null=True, blank=True,
> related_name='child_set')
>
> class Content(models.Model):
> category = models.ForeignKey(Category)
>
> So say the categories were like this:
>
> Languages
> -python
> -ruby
> -C++
> Frameworks
> -django
> -rails
> -j2ee
>
> I don't want any content to go into the languages or frameworks
> categories, only the child ones. Where would the logic to restrict the
> choice of category in Content within the admin interface?
>
Have you looked at the limit_choices_to argument for a ForeignKey (
http://www.djangoproject.com/documentation/model-api/#many-to-one-relationships
)?
> My best idea so far is to create a sub-class of ForeignKey called
> ContentCategoryField and override the validate method. In the validate
> method I could look up the id that was entered and see that has a parent id
> or not.
>
> I was also thinking of restricting my categories to be just 2 levels, like
> above. I could create a a ParentForCategoryField that overrides ForeignKey
> and it could check to make sure that any new category being created does not
> have a parent that also has a parent.
>
> Not sure if I'm on the right track here for a DRY method that will work
> with the admin interface and also with newforms (should I decide to make
> some of my own admin-like views).
Not sure if limit_choices_to will be DRY, since it's admin-specific, but it
seems designed to do what you are looking for in the admin interface, at
least.
Karen
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