如何在django中重写管理列名'is_staff‘和'is_superuser’？

from django.contrib.auth.models import UserManager

class CustomUserManager(UserManager):
    def get_by_natural_key(self, username):
        kwargs = {self.model.USERNAME_FIELD + '__iexact': username}
        return self.get(**kwargs)

    def create_superuser(self, username, email=None, password=None, **extra_fields):
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)
        return self._create_user(username, email, password, **extra_fields)

from django.contrib.auth.models import AbstractUser

class CustomUser(AbstractUser):
    objects = CustomUserManager()

AUTH_USER_MODEL = 'your_app.CustomUser'