Invalid number supplied!

Raise code

    f_with_iterable_of_validators = models.IntegerField(blank=True, null=True,
                                                        validators=(validate_answer_to_universe,))
    slug = models.SlugField(blank=True)

    def clean(self):
        super().clean()
        if self.number == 11:
            raise ValidationError('Invalid number supplied!')


class UniqueFieldsModel(models.Model):
    unique_charfield = models.CharField(max_length=100, unique=True)
    unique_integerfield = models.IntegerField(unique=True)
    non_unique_field = models.IntegerField()