How to make two m2m fields with a link to one table?

Question

Django

Model example

class Naznach(models.Model):

    GROUP = (
        ('Продукты', 'Продукты'),
        ('Общепит', 'Общепит'),
        ('Другое', 'Другое')
    )

    group = models.CharField("Группа", max_length=30, choices=GROUP, default="F")
    options = models.CharField("Назначения", max_length=100)

    def __str__(self):
        return self.options


class Client(models.Model):

    naznach_one = models.ManyToManyField(Naznach, verbose_name="Назначение №1")
    naznach_two = models.ManyToManyField(Naznach, blank=True, verbose_name="Назначение №2")

The bottom line is to make two fields for selection from the same table.
But an error is thrown

Answer 1

related_nameyou need to add or remove a backlink in each field related_name='+'. It also is written in an error. I advise you to use Google more often.

class Client(models.Model):
    naznach_one = models.ManyToManyField(Naznach, verbose_name="Назначение №1", related_name='naznach_one_set' )
    naznach_two = models.ManyToManyField(Naznach, blank=True, verbose_name="Назначение №2" related_name='naznach_two_set')