如何在ModelBackEnd中检查Django中的非活动用户

from django.contrib.auth.backends import ModelBackend

class CustomModelBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        # 在这里编写验证逻辑
        pass

from django.contrib.auth import get_user_model

class CustomModelBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        User = get_user_model()
        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            return None

        # 检查用户是否为非活动用户
        if not user.is_active:
            return None

        # 验证密码
        if user.check_password(password):
            return user
        else:
            return None

AUTHENTICATION_BACKENDS = [
    'myapp.backends.CustomModelBackend',
    'django.contrib.auth.backends.ModelBackend',
]