'Manager' object has no attribute 'get_by_natural_key' - django

Question

I know there are similar questions like this, and I tried every solution that is adressed in those questions. Here is my problem described;
When I execute createsuperuser, I got an error as follows;
AttributeError: 'Manager' object has no attribute 'get_by_natural_key'
Here is how I define UserAccountManager and UserAccount in my implementation;
from django.db import models
from django.contrib.auth.models import BaseUserManager, AbstractBaseUser
class UserAccountManager(BaseUserManager):
def create_user(self, email, first_name, last_name, password=None):
if not email:
raise ValueError('Email must be set!')
user = self.model(email=email, first_name=first_name, last_name=last_name)
user.set_password(password)
user.save(using=self._db)
return user
def create_superuser(self, email, first_name, last_name, password):
user = self.create_user(email, first_name, last_name, password)
user.is_admin = True
user.save(using=self._db)
return user
def get_by_natural_key(self, email_):
return self.get(code_number=email_)
class UserAccount(AbstractBaseUser):
email = models.EmailField(unique=True)
first_name = models.CharField(max_length=128)
last_name = models.CharField(max_length=128)
is_active = models.BooleanField(default=True) # default=False when you are going to implement Activation Mail
is_admin = models.BooleanField(default=False)
objects = UserAccountManager
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ['first_name', 'last_name']
def get_short_name(self):
return self.email
def get_full_name(self):
return self.email
def has_perms(self, perm, ob=None):
return True
def has_module_perms(self, app_label):
return True
def natural_key(self):
return self.email
#property
def is_staff(self):
self.is_admin
I set object as follows in UserAccount class : objects = UserAccountManager
What do I do wrong?
Edit (to address Iain Shelvington's solution):
in settings.py, I have this line;
AUTH_USER_MODEL = 'accounts.UserAccount'

Answer 1

It should be objects = UserAccountManager()
https://docs.djangoproject.com/en/1.10/topics/db/managers/#custom-managers-and-model-inheritance

Answer 2

You need to change the setting AUTH_USER_MODEL to 'your_app.UserAccount'