title: Custom User Model Django TypeError: create_user() missing 1 required positional argument: 'username'
body: <p>I am creating a custom User model and I am getting an error when I create my super user for the first time. Any advice, please. I would ideally like to user BOTH my <code>username</code> or <code>email</code> for verification interchangeably, but this may be a question for another day.</p>
  
  <p>I started initially with email as my <code>username_field</code> but changed after a while. Please, can someone provide guidance, please? I have posted my <code>models.py</code> file which sits inside the accounts app.</p>
  
  <pre><code>from django.db import models
  from django.contrib.auth.models import (
      AbstractBaseUser,
      BaseUserManager
  )
  
  
  class UserManager(BaseUserManager):
      def create_user(self, email,
                      username,
                      password=None,
                      is_active=True,
                      is_staff=False,
                      is_admin=False,
                      is_client=True,  # anyone registered can be a client
                      is_partner=False
  
                      ):
          if not username:
              raise ValueError("Unique username is required")
          if not email:
              raise ValueError("User must have an email address")
          if not password:
              raise ValueError("Password is required")
          user_obj = self.model(
              email=self.normalize_username(username)
          )
          user_obj.set_password(password)  # change user password
          user_obj.username = username
          user_obj.email = email
          user_obj.staff = is_staff
          user_obj.client = is_client
          user_obj.partner = is_partner
          user_obj.admin = is_admin
          user_obj.active = is_active
          user_obj.save(using=self._db)
          return user_obj
  
      def create_staff_user(self, username, password=None):
          user = self.create_user(
              username,
              password=password,
              is_staff=True
          )
          return user
  
      def create_partner_user(self, username, password=None):
          user = self.create_user(
              username,
              password=password,
              is_partner=True
          )
          return user
  
      def create_client_user(self, username, password=None):
          user = self.create_user(
              username,
              password=password,
              is_client=True
          )
          return user
  
      def create_superuser(self, username, password=None):
          user = self.create_user(
              username,
              password=password,
              is_staff=True,
              is_admin=True
          )
          return user
  
  
  class User(AbstractBaseUser):
      username = models.CharField(unique=True, max_length=255)
      full_name = models.CharField(max_length=255, blank=True, null=True)
      email = models.EmailField(unique=True, max_length=255)
      active = models.BooleanField(default=True)  # can login
      staff = models.BooleanField(default=False)  # staff user non super
      admin = models.BooleanField(default=False)  # superuser
      timestamp = models.DateTimeField(auto_now_add=True)
  
      USERNAME_FIELD = 'username'  # username
      REQUIRED_FIELDS = []  #['full_name']
  
      objects = UserManager()
  
      def __str__(self):
          return self.username
  
      def get_full_name(self):
          return self.username
  
      def get_short_name(self):
          return self.username
  
      @property
      def is_staff(self):
          return self.staff
  
      @property
      def is_partner(self):
          return self.partner
  
      @property
      def is_client(self):
          return self.client
  
      @property
      def is_admin(self):
          return self.admin
  
      @property
      def is_active(self):
          return self.active
  </code></pre>
  
  <p>The error from shell is as below </p>
  
  <pre><code>PS C:\Users\User\Desktop\protectandserve&gt; python manage.py createsuperuser
  Username: xxxxxxxx
  Password:
  Password (again):
  Traceback (most recent call last):
    File "manage.py", line 15, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1.1-py3.7.egg\django\core\management\__init__.py", line 381, in execute_from_command_line
      utility.execute()
    File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1.1-py3.7.egg\django\core\management\__init__.py", line 375, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1.1-py3.7.egg\django\core\management\base.py", line 316, in run_from_argv
      self.execute(*args, **cmd_options)
    File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1.1-py3.7.egg\django\contrib\auth\management\commands\createsuperuser.py", line 59, in execute
      return super().execute(*args, **options)
    File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1.1-py3.7.egg\django\core\management\base.py", line 353, in execute
      output = self.handle(*args, **options)
    File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1.1-py3.7.egg\django\contrib\auth\management\commands\createsuperuser.py", line 184, in handle
      self.UserModel._default_manager.db_manager(database).create_superuser(**user_data)
    File "C:\Users\User\Desktop\protectandserve\accounts\models.py", line 68, in create_superuser
      is_admin=True
  TypeError: create_user() missing 1 required positional argument: 'username'
  PS C:\Users\User\Desktop\protectandserve&gt;
  </code></pre>