Hi Daniel
Thank you for the tip. Now it works :-)
class CategoryItemForm(ModelForm):
class Meta:
model = CategoryItem
exclude = ('position','defaultItem') #These two attributes
shall only be changed in list view
def clean(self):
"""
Checks whether the title is unique for all items associated
with the
current Category.
"""
cleaned_data = self.cleaned_data
query = CategoryItem.all().ancestor(self.instance.parent())
categoryItems = query.fetch(1000)
myTitle = cleaned_data.get('title')
for item in categoryItems:
if item.title == myTitle:
raise ValidationError("The title must be unique, but
it "
"is already used for another category item.")
return cleaned_data
On Nov 26, 10:34 am, Daniel Roseman <[EMAIL PROTECTED]>
wrote:
> On Nov 26, 8:07 am,vanosten<[EMAIL PROTECTED]> wrote:
>
> > Hi
>
> > I need to do custom validation to make sure that a new record does not
> > pick the same title as a previous record. Therefore in my overriden
> > clean method in my custom Form (which extends ModelForm) I need to be
> > able to do either of the following:
> > # access the session, where the parent object is saved
> > # access the POST request object to access session, to do the same as
> > above
> > # access the model instance, to get to the parent
>
> > How can I do this?
>
> You can access the model instance via form.instance.
>
> To get access to the request, you'll need to pass it in to the form
> somehow. The best way is probably to override the form's __init__
> method to add a request parameter and save it as self.request - you
> can then pick it up in the clean method.
>
> However it's not clear why you need to access the session - there's no
> need to do if you just want to do model queries.
> --
> DR.
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