Is it possible to combine two CharField fields in models?

Question

Django

Is it possible to combine two fields through a slash and check for unique on it?

Let's say

class Factory(models.Model):
    city = models.CharField('Город', max_length=30)
    name = models.CharField('Наименование организации', max_length=50)
    uniquetincity = city + '/' + tin(verbose_name='Город/ИНН', unique=True)

Or how to implement it

Answer 1

class Meta:
        unique_together = ('city', 'tin')

Two fields - one model must be

Answer 2

https://qna.habr.com/answer?answer_id=1808781#answ...