我尝试做的是检测登录用户的类型，然后将.profile参数设置为request.user，这样我就可以通过在视图中调用request.user.profile来使用它。
为此，我编写了一个Middleware，如下所示：

class SetProfileMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):

        user, token = JWTAuthentication().authenticate(request)
        profile_type = token.payload.get("profile_type", None)

        request.user.profile = User.get_profile(profile_type, request.user)
        request.user.profile_type = profile_type
        
        # Works Here
        print("-" * 20)
        print(type(request.user)) # <class 'django.utils.functional.SimpleLazyObject'>
        print('Process Request ->', request.user.profile)

        response = self.get_response(request)

        # Does not work here
        print("-" * 20)
        print(type(request.user)) #  <class 'users.models.User'>
        print('Process Response ->', request.user.profile)

        return response

    def process_view(self, request, view_func, view_args, view_kwargs):
        # Works here
        print("-" * 20)
        print(type(request.user)) # <class 'django.utils.functional.SimpleLazyObject'>
        print('Process View ->', request.user.profile)

现在我可以在process_view中访问request.user.profile，但它不存在于我的视图中，并导致AttributeError声明'User' object has no attribute 'profile'。
似乎我的request.user是被覆盖的地方之前击中的看法。
请注意，我使用的是Django Rest框架，以下是我的观点：

class ProfileAPIView(generics.RetrieveUpdateAPIView):
    serializer_class = ProfileSerializer

    def get_object(self):
        obj = self.request.user.profile # Raise the `AttributeError`
        self.check_object_permissions(self.request, obj)
        return obj

下面是我的settings.py：

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
]

LOCAL_MIDDLEWARE = [
    "users.middleware.SetProfileMiddleware",
]

MIDDLEWARE = MIDDLEWARE + LOCAL_MIDDLEWARE

REST_FRAMEWORK = {
    "DEFAULT_PERMISSION_CLASSES": ("rest_framework.permissions.IsAuthenticated",),
    "DEFAULT_RENDERER_CLASSES": (
        "rest_framework.renderers.JSONRenderer",
        "rest_framework.renderers.BrowsableAPIRenderer",
    ),
    "DEFAULT_AUTHENTICATION_CLASSES": [
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ],
}

SIMPLE_JWT = {
    "SLIDING_TOKEN_REFRESH_LIFETIME": timedelta(minutes=45),
    "AUTH_TOKEN_CLASSES": ("rest_framework_simplejwt.tokens.SlidingToken",),
}

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

AUTH_USER_MODEL = "users.User"

LOGIN_REDIRECT_URL = "admin/"