如何在ModelBackEnd中检查Django中的非活动用户

我如何检查ModelBackEnd中的非活动自定义用户而不返回None（如AllowlUsersModelBackend所做的）？以下是我目前掌握的情况：

from django.contrib.auth import backends, get_user_model
from django.db.models import Q
UserModel = get_user_model()


class ModelBackend(backends.ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        if username is None:
            username = kwargs.get(UserModel.USERNAME_FIELD)
        try:
            # user = UserModel._default_manager.get_by_natural_key(username)
            # You can customise what the given username is checked against, here I compare to both username and email fields of the User model
            user = UserModel.objects.get(Q(username__iexact=username) | Q(email__iexact=username))
            #print("what is going on")
        except UserModel.DoesNotExist:
            # Run the default password hasher once to reduce the timing
            # difference between an existing and a nonexistent user (#20760).
            UserModel().set_password(password)
        else:
            if user.check_password(password) and self.user_can_authenticate(user):
                return user
        return super().authenticate(request, username, password, **kwargs)

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获取用户实例时，将条件添加到查询中

user = UserModel.objects.exclude(is_active=False).get(Q(username__iexact=username) | Q(email__iexact=username))

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你想干什么？允许非活动用户登录？我只需要在登录期间检测is_active=False的帐户。用于什么目的？我只想阻止禁用的帐户重新登录。我通过在try语句中返回用户就知道了。