That answer for your problem
oh men sorry my bad
i have this
class NormalUser(models.Model):
user = models.OneToOneField(
User,
verbose_name=_("User"),
on_delete=models.CASCADE,
unique=True,
)
phone_number = models.CharField(
verbose_name=_("Phone number"),
max_length=11,
null=True, blank=True,
validators=[RegexValidator(regex=r"^[0][9][0123][0-9]{8,8}$")]
)
def __str__(self):
return self.user.username