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django.core.exceptions.FieldDoesNotExist: User has no field named ‘username’

I’m trying to customize django’s AbstractUser. When I try to reset username to None, I get the following exception:

"django.core.exceptions.FieldDoesNotExist: User has no field named 'username'".

Here is my code:

class UserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, email, password, **extra_fields):
        if not email:
            raise ValueError("L'adresse e-mail donnée doit etre definie")
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password, **extra_fields):
        extra_fields.setdefault("is_staff", False)
        extra_fields.setdefault("is_superuser", False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password, **extra_fields):
        extra_fields.setdefault("is_staff", True)
        extra_fields.setdefault("is_superuser", True)

        if extra_fields.get("is_staff") is not True:
            raise ValueError("Superuser must have is_staff=True")
        if extra_fields.get("is_superuser") is not True:
            raise ValueError("Superuser must have is_superuser=True")
        return self._create_user(email, password, **extra_fields)


class User(AbstractUser):
    username = None
    email = models.EmailField('email adress', unique=True)
    telephone = models.CharField(max_length=20)
    REQUIRED_FIELDS = []

What can I do to solve this problem?

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Answer

You haven’t set a value for USERNAME_FIELD in your code. This must be set to a field that uniquely identifies a user instance. AbstractUser sets this to 'username' and hence you are getting the error. You can set this to 'email' to solve your problem:

class User(AbstractUser):
    username = None
    email = models.EmailField('email adress', unique=True)
    telephone = models.CharField(max_length=20)
    # set below value
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []
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