Django 视图集没有属性“get_extra_actions”

Question

我第一次使用 Django，我正在尝试构建一个 API，我正在遵循一些教程和示例，它工作正常，但我现在在安装所有要求后在 Raspberry Pi 中运行该项目并且项目失败并出现以下错误：

    Performing system checks...

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0xb547adb0>
Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.5/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/home/pi/.local/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 120, in inner_run
    self.check(display_num_errors=True)
  File "/home/pi/.local/lib/python3.5/site-packages/django/core/management/base.py", line 364, in check
    include_deployment_checks=include_deployment_checks,
  File "/home/pi/.local/lib/python3.5/site-packages/django/core/management/base.py", line 351, in _run_checks
    return checks.run_checks(**kwargs)
  File "/home/pi/.local/lib/python3.5/site-packages/django/core/checks/registry.py", line 73, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/home/pi/.local/lib/python3.5/site-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/home/pi/.local/lib/python3.5/site-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/home/pi/.local/lib/python3.5/site-packages/django/urls/resolvers.py", line 397, in check
    for pattern in self.url_patterns:
  File "/home/pi/.local/lib/python3.5/site-packages/django/utils/functional.py", line 36, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/pi/.local/lib/python3.5/site-packages/django/urls/resolvers.py", line 536, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/home/pi/.local/lib/python3.5/site-packages/django/utils/functional.py", line 36, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/pi/.local/lib/python3.5/site-packages/django/urls/resolvers.py", line 529, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 673, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/home/pi/Projects/openvpn-monitor/openvpnmonitor/urls.py", line 24, in <module>
    url(r'^api/', include('openvpnmonitor.api.urls')),
  File "/home/pi/.local/lib/python3.5/site-packages/django/urls/conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 673, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/home/pi/Projects/openvpn-monitor/openvpnmonitor/api/urls.py", line 16, in <module>
    urlpatterns += router.urls
  File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 101, in urls
    self._urls = self.get_urls()
  File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 363, in get_urls
    urls = super(DefaultRouter, self).get_urls()
  File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 261, in get_urls
    routes = self.get_routes(viewset)
  File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 176, in get_routes
    extra_actions = viewset.get_extra_actions()
AttributeError: type object 'SessionViewSet' has no attribute 'get_extra_actions'

我的views.py有以下代码：

from django.shortcuts import render

from rest_framework import viewsets
from .models import Session
from .serializers import SessionSerializer

from rest_framework.views import APIView, Response


class SessionViewSet(APIView):
    queryset = Session.objects.all()
    serializer_class = SessionSerializer

    def get(self, request, format=None):
        return Response("test")

我真的不知道为什么可以在我的笔记本电脑上工作，但它却不能在我的 Raspberry Pi 上工作。

有人或任何人知道为什么会发生这种情况吗？

非常感谢！

编辑：

这是我的 urls.py

from django.conf.urls import url
from rest_framework import routers
from openvpnmonitor.api.views import SessionViewSet

router = routers.DefaultRouter()
router.register(r'sessions', SessionViewSet)

urlpatterns = [
    url(r'sessions', SessionViewSet.as_view()),
    url(r'^docs/', schema_view),
]

urlpatterns += router.urls

Answer 1

注意不要为视图集类和模型类使用相同的名称。这就是我自己错误的原因。查看我所做的示例

# inside member/views.py
from member.models import Member

# inheriting from model viewset but called Member
class Member(viewsets.ModelViewSet):
    queryset = Member.objects.all()
    ...

# inside urls.py
from member.views import Member

router = routers.DefaultRouter()
router.register(r'member', Member)

现在这里的错误是它导入了成员模型而不是视图集，但它们的名称相同

Answer 2

在我的例子中，我所做的是我从位于 rest_framework 模块中的 viewsets.Viewset 继承了我的视图，此外，我在注册期间在 router.register() 函数中添加了 basename = your_name 参数。

视图看起来像：

class SessionViewSet(viewsets.ViewSet):
    queryset = Session.objects.all()
    serializer_class = SessionSerializer

    def get(self, request, format=None):
        return Response("test")

路由器注册看起来像：

router.register(r'your_app_name', YourModelNameView, basename='your_app_name')

Answer 3

为：

djangorestframework==3.11.0
Django==2.2.9

您需要更改class SessionViewSet(APIView): 到：

from rest_framework import mixins, viewsets

class SessionViewSet(mixins.ListModelMixin,
                     viewsets.GenericViewSet):

让它工作。 DRF 的内部结构发生了一些变化，其他解决方案不再适用。

Answer 4

在views.py中，你的viewset必须继承viewset并在你的viewset中使用它试试下面的代码：

class SessionViewSet(viewsets.ModelViewSet):
    queryset = Session.objects.all()
    serializer_class = SessionSerializer

    def get(self, request, format=None):
        return Response("test")

Answer 5

在 Django Rest Framework v3.8 之前，您可以直接向路由器注册 APIView。我广泛地这样做是为了为一些 非常 自定义 API 端点获得一个很好的整理（和版本化）自动文档 API。如果再有选择，我可能会以更标准的方式编写整个内容，但这不是每个人的选择。

但在深入研究错误之后，事实证明您可以通过为路由器提供所需的内容并添加一个虚拟的 get_extra_actions 类方法来修补问题。

class MyAPIView(APIView):

    @classmethod
    def get_extra_actions(cls):
        return []

#...

我并不是说这很好，但它现在有效。
我拿回了我的文档，并成功升级到 DRFv3.8。

Answer 6

你称它为视图集，但这并不能使它成为一个；您从 APIView 继承，这是一个独立的通用视图，而不是视图集。

视图集需要从viewsets.ViewSet 继承。