On Wed, 2007-11-14 at 10:15 +0100, Jens Diemer wrote:
>
> I would like to escape the data from a model attribute...
>
> Here a example:
>
>
>
> Old model:
> -------------------------------------------------------------
> class Page(models.Model):
> ...
> name = models.CharField()
> ...
> -------------------------------------------------------------
>
>
> I have changed the model to this:
> -------------------------------------------------------------
> class Page(models.Model):
> ...
> __name = models.CharField(
> db_column='name'
> )
> def __get_name(self):
> return escape(self.__name)
>
> def __set_name(self, data):
> self.__name = data
>
> name = property(__get_name, __set_name)
> ...
> -------------------------------------------------------------
>
>
>
> Now, i have a problem :(
>
> This works, fine:
> page = Page.objects.all()[0]
> print page.name
>
>
> But here i get a 'FieldDoesNotExist' Traceback:
> print Page.objects.values("name")
>
[...]
>
> Why?
> Is this a bug?
Everything is behaving normally. You just can't do what you're trying to
do. When the class is constructed (when the __new__ method is called),
Django doesn't know (and has no way of possibly knowing) that the "name"
property is simply a proxy for the "__name" Field object. And Django
does special initialisation processing for Field objects, including
creating a list of fields on the model.
So, when you are trying to use your field in a queryset, you must refer
to it using it's true name ("__name" in your case).
Malcolm
--
Atheism is a non-prophet organization.
http://www.pointy-stick.com/blog/
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