ProFi/core/models.py

from django.db import models

class ContactMixin(models.Model):
    first_name = models.CharField(max_length=100, verbose_name="Имя")
    last_name = models.CharField(max_length=100, verbose_name="Фамилия", blank=True, null=True)
    middle_name = models.CharField(max_length=100, blank=True, null=True, verbose_name="Отчество")
    phone = models.CharField(max_length=20, blank=True, null=True, verbose_name="Телефон")
    email = models.EmailField(blank=True, null=True, verbose_name="Почта")

    def __str__(self):
        return " ".join(filter(bool, [self.last_name, self.first_name]))

    class Meta:
        abstract = True