Re: optional ForeignKey

On Mon, Jun 21, 2010 at 10:37 AM, Magnus Valle <wiscados@gmail.com> wrote:

Hi,
I'm trying to make model that has itself as a foreign key, in an
attempt to store a reverse tree in Django.
However, I can't find a way to set a default value to
models.ForeignKey or make it optional.

My model is like this:
class Node(models.Model):
   name = models.CharField(max_length=100)
   parent = models.ForeignKey('self')

runserver doesn't complain, but whenever I try to enter data to the
model with Django's admin interface I get a "This field is required."
message, and it want's me to select a entry, but there are none.

You make a ForeignKey field optional by specifying blank=True, null=True:

http://docs.djangoproject.com/en/1.2/ref/models/fields/#null

Karen
--
http://tracey.org/kmt/

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