Issues with custom User model - using email instead of username

[annaberglind]

Hi, thanks for this library!

I just have one small problem. My API uses a custom User model which does not have a username, only email.

I have an application using grant_type="password"
Django-oauth-toolkit supports this and if I call the django-oauth-toolkit route /o/token with username=[email protected] it understands it and I can get a token

However if I use your endpoint /auth/token I get
'User' object has no attribute 'username'

My User model for reference:

class User(AbstractBaseUser, PermissionsMixin):
    """The User model with email as a "username"."""

    email = models.EmailField(_('email address'), unique=True)
    name = models.CharField(max_length=255, blank=True) 
    is_staff = models.BooleanField(
        _('staff status'),
        default=False,
        help_text=_(
            'Designates whether the user can log into this admin site.',
        ),
    )
    is_active = models.BooleanField(
        _('active'),
        default=True,
        help_text=_(
            'Designates whether this user should be treated as active. ' +
            'Unselect this instead of deleting accounts.',
        ),
    )

    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
    date_added = models.DateTimeField(auto_now_add=True)
    date_updated = models.DateTimeField(auto_now=True)

    EMAIL_FIELD = 'email' 
    USERNAME_FIELD = 'email' 
    REQUIRED_FIELDS: list[str] = [] 

    objects = UserManager()

    class Meta(object):
        verbose_name = _('user')
        verbose_name_plural = _('users')

    def clean(self):
        """Normalize the email before save."""
        super().clean()
        self.email = self.__class__.objects.normalize_email(self.email)  # noqa: WPS601, E501

    def __str__(self) -> str:  # noqa: D105
        return textwrap.shorten(
            text=self.name or self.email,
            width=40,  # noqa: WPS432
            placeholder='...',
        )

Do you know any workaround for me with this problem?