В _validate_username Ошибка AttributeError: объект 'Manager' не имеет атрибута 'get_by_natural_key'

model.py

from django.db import models
from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin
from .managers import UserAccountManager
        
class UserAccount(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(
        max_length=255,
        unique=True,
        # null=False,
        # blank=False,
        verbose_name="email",
    )
    name = models.CharField(max_length=255)
            
    is_active=models.BooleanField(
        default=True,
        )
    is_staff=models.BooleanField(
        default=False,
        )
    is_admin=models.BooleanField(
        default=False,
        )
    created_at=models.DateTimeField(auto_now_add=True)
        
    objects: UserAccountManager()
        
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['name']
           
    def __str__(self):
       return self.email

managers.py

'''

from django.contrib.auth.models import BaseUserManager

class UserAccountManager(BaseUserManager): def create_user(self, email, name, password=None): """Создает и сохраняет пользователя с заданными email, именем и паролем.""" if not email: raise ValueError('Пользователи должны иметь адрес электронной почты')

    email=self.normalize_email(email)
    email = email.lower()
    
    user = self.model(
        email=email,
        name=name
    )
   
    user.set_password(password)
    user.save(using=self._db)
    return user
    
def create_admin(self, email, name, password=None):
    """
    Creates and saves a superuser with the given email, name and password.
    """
    user = self.create_user(email, name, password)
    user.is_admin = True
    user.is_staff = True
    user.save(using=self._db)
    return user
        
def create_superuser(self, email, name, password=None):
    """
    Creates and saves a superuser with the given email, name and password.
    """
    user = self.create_user(email, name, password)
    user.is_staff = True
    user.is_admin = True
    user.is_superuser = True
    user.save(using=self._db)
    return user

'''

Вы аннотировали objects, вы не установили его в объект UserAccountManager(), действительно:

class UserAccount(AbstractBaseUser, PermissionsMixin):
    # …
    #       🖟 use equal sign (=)
    objects = UserAccountManager()
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