@method_decorator(csrf_exempt) NameError: name 'method_decorator' is not defined

Question

我一直在遵循以下关于如何创建聊天机器人的指南 (https://abhaykashyap.com/blog/post/tutorial-how-build-facebook-messenger-bot-using-django-ngrok)，直到我更新 views.py 的部分。方法声明似乎有问题，我不知道出了什么问题。除此之外，代码几乎与指南完全相同（指南创建者忘记添加一些导入）。这是我在虚拟环境中尝试运行服务器时遇到的错误：

(ivanteongbot) Ivans-MacBook-Pro:ivanteongbot ivanteong$ python manage.py runserver
Performing system checks...

Unhandled exception in thread started by <function wrapper at 0x1097a2050>
Traceback (most recent call last):
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 121, in inner_run
    self.check(display_num_errors=True)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/core/management/base.py", line 385, in check
    include_deployment_checks=include_deployment_checks,
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/core/management/base.py", line 372, in _run_checks
    return checks.run_checks(**kwargs)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/core/checks/registry.py", line 81, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/core/checks/urls.py", line 14, in check_url_config
    return check_resolver(resolver)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/core/checks/urls.py", line 24, in check_resolver
    for pattern in resolver.url_patterns:
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/utils/functional.py", line 35, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/urls/resolvers.py", line 310, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/utils/functional.py", line 35, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/urls/resolvers.py", line 303, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/ivanteong/Desktop/comp9323/ivanteongbot/ivanteongbot/urls.py", line 24, in <module>
    url(r'^fb_ivanteongbot/', include('fb_ivanteongbot.urls')),
  File "/Users/ivanteong/Envs/ivanteongbot/lib/python2.7/site-packages/django/conf/urls/__init__.py", line 50, in include
    urlconf_module = import_module(urlconf_module)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/ivanteong/Desktop/comp9323/ivanteongbot/fb_ivanteongbot/urls.py", line 3, in <module>
    from .views import IvanTeongBotView
  File "/Users/ivanteong/Desktop/comp9323/ivanteongbot/fb_ivanteongbot/views.py", line 8, in <module>
    class IvanTeongBotView(generic.View):
  File "/Users/ivanteong/Desktop/comp9323/ivanteongbot/fb_ivanteongbot/views.py", line 15, in IvanTeongBotView
    @method_decorator(csrf_exempt)
NameError: name 'method_decorator' is not defined

以下代码是我在 views.py 中用于我的应用程序目录的代码：

from django.shortcuts import render

# ivanteongbot/fb_ivanteongbot/views.py
from django.views import generic
from django.http.response import HttpResponse
from django.views.decorators.csrf import csrf_exempt # add this
# Create your views here.
class IvanTeongBotView(generic.View):
    def get(self, request, *args, **kwargs):
        if self.request.GET['hub.verify_token'] == '2318934571':
            return HttpResponse(self.request.GET['hub.challenge'])
        else:
            return HttpResponse('Error, invalid token')

    @method_decorator(csrf_exempt)
    def dispatch(self, request, *args, **kwargs):
        return generic.View.dispatch(self, request, *args, **kwargs)

    # Post function to handle Facebook messages
    def post(self, request, *args, **kwargs):
        # Converts the text payload into a python dictionary
        incoming_message = json.loads(self.request.body.decode('utf-8'))
        # Facebook recommends going through every entry since they might send
        # multiple messages in a single call during high load
        for entry in incoming_message['entry']:
            for message in entry['messaging']:
                # Check to make sure the received call is a message call
                # This might be delivery, optin, postback for other events 
                if 'message' in message:
                    # Print the message to the terminal
                    print(message)     
        return HttpResponse()

这是我的 urls.py:

# ivanteongbot/fb_ivanteongbot/urls.py
from django.conf.urls import include, url # add this
from .views import IvanTeongBotView
urlpatterns = [
                url(r'^99789126bd00b5454d999cf3a9c3f8a9274d4e1460ac4b9863/?$', IvanTeongBotView.as_view()) 
              ]

不确定方法声明有什么问题，因为我进行了一些谷歌搜索，它似乎按照我的用户指南以正确的方式声明。

Answer 1

您正在阅读的教程遗漏了一些重要的导入，例如提供 method_decorator:

的导入

from django.utils.decorators import method_decorator

跟随 "View code on github" link 可能会有所帮助，它会将您带到 more complete file。

@method_decorator(csrf_exempt) NameError: name 'method_decorator' is not defined

@method_decorator(csrf_exempt) NameError: name 'method_decorator' is not defined

python

django

server

bots

method-declaration