Question

我一直在浏览Django Rest Framework的教程，以构建一个简单的待办事项列表应用程序。

当我从基于函数的视图转换到基于类的视图时，我开始获取到Django的堆栈跟踪，并且所有http调用都开始失败。

我使用virtualenv来隔离依赖项，并使用Python 3.5.2。

任何人对于发生了什么或如何解决此错误有任何想法？

我将此问题归咎于配置错误或版本不匹配，但我不知道从哪里开始。

/views.py：

from django.http import Http404
from list.models import List
from list.serializers import ListSerializer
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status

class ListsView(APIView):
        """
        List all lists.
        """
        def get(self, request, format=None):
                lists = List.objects.all()
                serializer = ListSerializer(lists, many=True)
                return Response(serializer.data)

        ...

/urls.py

from django.conf.urls import url
from rest_framework.urlpatterns import format_suffix_patterns
from list import views

urlpatterns = [
    url(r'^lists/$', views.ListsView),
    url(r'^lists/(?P<pk>[0-9]+)/$', views.ListView),
    url(r'^lists/(?P<list>[0-9]+)/items/$', views.ListItemsView),
    url(r'^lists/(?P<list>[0-9]+)/items/(?P<pk>[0-9]+)/$', views.ListItemView),
]

urlpatterns = format_suffix_patterns(urlpatterns)

输入：

curl http://localhost:8000/lists/

跟踪：

Internal Server Error: /lists/
Traceback (most recent call last):
  File "<pwd>/env/lib/python3.5/site-packages/django/core/handlers/exception.py", line 39, in inner
    response = get_response(request)
  File "<pwd>/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "<pwd>/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "<pwd>/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
TypeError: __init__() takes 1 positional argument but 2 were given
[29/Aug/2016 00:03:32] "GET /lists/ HTTP/1.1" 500 61615

ENV：

python 3.5.2

要求：

Django==1.10
django-lint==2.0.4
djangorestframework==3.4.6
logilab-astng==0.24.3
logilab-common==1.2.2
psycopg2==2.6.2
Pygments==2.1.3
pylint==0.28.0
six==1.10.0

Answer 1

@SergeyGornostaev有正确的直觉来查看并发布urls.py。

在从基于函数的视图到基于类的视图的重构中，当我更新路由时，我忽略了对视图调用as_view()。

之前：url(<pattern>, views.ListsView)

之后：url(<pattern>, views.ListView.as_view())

这解决了错误。

之前的完整/urls.py：

from django.conf.urls import url
from rest_framework.urlpatterns import format_suffix_patterns
from list import views

urlpatterns = [
    url(r'^lists/$', views.ListsView),
    url(r'^lists/(?P<pk>[0-9]+)/$', views.ListView),
    url(r'^lists/(?P<list>[0-9]+)/items/$', views.ListItemsView),
    url(r'^lists/(?P<list>[0-9]+)/items/(?P<pk>[0-9]+)/$', views.ListItemView),
]

urlpatterns = format_suffix_patterns(urlpatterns)

完整的/urls.py之后：

from django.conf.urls import url
from rest_framework.urlpatterns import format_suffix_patterns
from list import views

urlpatterns = [
    url(r'^lists/$', views.ListsView.as_view()),
    url(r'^lists/(?P<pk>[0-9]+)/$', views.ListView.as_view()),
    url(r'^lists/(?P<list>[0-9]+)/items/$', views.ListItemsView.as_view()),
    url(r'^lists/(?P<list>[0-9]+)/items/(?P<pk>[0-9]+)/$', views.ListItemView.as_view()),
]

urlpatterns = format_suffix_patterns(urlpatterns)

在Django Rest Framework中将基于函数的视图更新为基于类的视图时出错

1 个答案: