Here is the code :
class Category(models.Model):
parent = models.ForeignKey('self', blank=True, null=True)
name = models.CharField(max_length=63)
def __unicode__(self):
return self.name
I don't understand why but when I create a category in the admin page,
there is this error :
Exception Type: IntegrityError
Exception Value: commercial_category.parent_id may not be NULL
I try to make the parent ForeignKey optional but it doesn't work
Thanks for you help
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