thanks tracy, i'd tried something very similar to Daniels method and
failed, but your code worked first time.
On Aug 15, 12:36 pm, Karen Tracey <kmtra...@gmail.com> wrote:
> On Mon, Aug 15, 2011 at 4:51 AM, i...@webbricks.co.uk
> <i...@webbricks.co.uk>wrote:
>
>
>
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>
> > I want to display the Level of the Category that the product belongs
> > to, in the admin page for the Product. snipped a lot of the
> > unimportant fields out of the display below.
>
> > class Category(models.Model):
> > name = models.CharField(max_length=50, default=False)
> > level = models.IntegerField(help_text="1, 2 ,3 or 4")
>
> > class Product(models.Model):
> > category = models.ForeignKey(Category)
> > name = models.CharField(max_length=100)
>
> > prepopulated_fields = {'slug': ('name',)}
> > fieldsets = [
> > ('Product Info',{'fields': ['name',
> > 'slug','partno','description']}),
> > ('Categorisation',{'fields': ['brand','category']}),
>
> > You can do this so long as you only want to display the level, and not
>
> change it from the Product edit page. Admin was not designed to allowed
> editing of related-model attributes so you cannot do that. But with readonly
> fields you can easily display information:
>
> 1 - Define a method on Product that returns the information you want, eg:
>
> def category_level(self):
> try:
> return u'%s' % self.category.level
> except Category.DoesNotExist:
> return u'No Category'
>
> (You need to allow for Category not existing since it will not exist on an
> add page.)
>
> 2 - Include that method in readonly_fields and wherever you want it in your
> fieldsets, eg:
>
> class ProductAdmin(admin.ModelAdmin):
> readonly_fields = ['category_level']
> fieldsets = [
> ('Product Info',{'fields': ['name', etc etc etc ]}),
> ('Categorisation',{'fields': ['category', 'category_level']}),
> ]
>
> Karen
> --http://tracey.org/kmt/
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