Auto unique slugs for Django models

gistfile1.py

def save(self, *args, **kwargs):
    """
    Create a unique slug from the title by appending an index.
    """
    if self.id is None:
        self.slug = slugify(self.title)
        i = 0
        while True:
            if i > 0:
                self.slug = "%s-%s" % (self.slug, i)
            if not self.__class__.objects.filter(slug=self.slug):
                break
            i += 1
    super(MyModel, self).save(*args, **kwargs)