#Models.py
class MyModel(models.Model):

    slug = models.SlugField(null=True, blank=True, unique=True)

    def _get_unique_slug(self, slug_input):
        slug = slugify(slug_input)
        unique_slug = slug
        num = 1
        while Curriculum.objects.filter(slug=unique_slug).exists():
            unique_slug = '{}-{}'.format(slug, num)
            num += 1
        return unique_slug

    def save(self, *args, **kwargs):
        if not self.id:  # Create
            if not self.slug:  # slug is blank
                self.slug = self._get_unique_slug(slug_input=self.title)
            else:  # slug is not blank
                self.slug = self._get_unique_slug(slug_input=self.slug)
        else:  # Update
            self.slug = self._get_unique_slug(slug_input=self.slug)
        super(Curriculum, self).save(*args, **kwargs)