Question

教程5：关系和超链接API错误教程链接地址为：https://www.django-rest-framework.org/tutorial/5-relationships-and-hyperlinked-apis/ 我尝试了与查询相关的解决方案，并且在stackoverflow上遇到了类似的问题，但是经过测试，我仍然无法使用它们。

views.py

class SnippetList(generics.ListCreateAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)
class SnippetDetail(generics.RetrieveDestroyAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer
    permission_classes = (permissions.IsAuthenticatedOrReadOnly, IsOwnerOrReadOnly)


class UserList(generics.ListAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer


class UserDetail(generics.RetrieveAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer


@api_view(['GET'])
def api_root(request, format=None):
    return Response({
        'users': reverse('user-list', request=request, format=format),
        'snippets': reverse('snippet-list', request=request, format=format),
    })


class SnippetHighlight(generics.GenericAPIView):
    queryset = Snippet.objects.all()
    renderer_classes = [renderers.StaticHTMLRenderer]

    def get(self, request, *args, **kwargs):
        snippet = self.get_object()
        return Response(snippet.highlighted)

urls.py

urlpatterns = format_suffix_patterns([
    path('', views.api_root),
    path('snippets/', views.SnippetList.as_view(), name='snippet-list'),
    path('snippets/<int:pk>/', views.SnippetDetail.as_view(), name='snippet-detail'),
    path('snippets/<int:pk>/highlight/',  views.SnippetHighlight.as_view(), name='snippet-highlight'),
    path('users/', views.UserList.as_view(), name='user-list'),
    path('users/<int:pk>/', views.UserDetail.as_view(), name='user-detail'),
])
urlpatterns += [
    path(r'api-auth/', include('rest_framework.urls', namespace='rest_framework'))
]

serializers.py

class SnippetSerializer(serializers.HyperlinkedModelSerializer):
    owner = serializers.ReadOnlyField(source='owner.username')
    highlight = serializers.HyperlinkedIdentityField(view_name='snippet-highlight', format='html')

    class Meta:
        model = Snippet
        fields = ['url', 'id', 'highlight', 'owner',
              'title', 'code', 'linenos', 'language', 'style']


class UserSerializer(serializers.HyperlinkedModelSerializer):
    snippets = serializers.HyperlinkedRelatedField(many=True, view_name='snippet-detail', read_only=True)

    class Meta:
        model = User
        fields = ['url', 'id', 'username', 'snippets']

跟踪错误：

Traceback:
File "C:\Anaconda3\envs\python36\lib\site-packages\django\core\handlers\exception.py" in inner 34. response = get_response(request)

File "C:\Anaconda3\envs\python36\lib\site-packages\django\core\handlers\base.py" in _get_response 126. response = self.process_exception_by_middleware(e, request)

File "C:\Anaconda3\envs\python36\lib\site-packages\django\core\handlers\base.py" in _get_response 124. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Anaconda3\envs\python36\lib\site-packages\django\views\decorators\csrf.py" in wrapped_view 54. return view_func(*args, **kwargs)

File "C:\Anaconda3\envs\python36\lib\site-packages\django\views\generic\base.py" in view 68. return self.dispatch(request, *args, **kwargs)

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\views.py" in dispatch 505. response = self.handle_exception(exc)

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\views.py" in handle_exception 465. self.raise_uncaught_exception(exc)

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\views.py" in raise_uncaught_exception 476. raise exc

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\views.py" in dispatch 502. response = handler(request, *args, **kwargs)

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\decorators.py" in handler 50. return func(*args, **kwargs)

File "C:\Users\Ze Ran Lu\Desktop\swie\text\tutorials\snippets\views.py" in api_root 205. 'users': reverse('user-list'),

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\reverse.py" in reverse 47. url = _reverse(viewname, args, kwargs, request, format, **extra)

File "C:\Anaconda3\envs\python36\lib\site-packages\rest_framework\reverse.py" in _reverse 60. url = django_reverse(viewname, args=args, kwargs=kwargs, **extra)

File "C:\Anaconda3\envs\python36\lib\site-packages\django\urls\base.py" in reverse 90. return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))

File "C:\Anaconda3\envs\python36\lib\site-packages\django\urls\resolvers.py" in _reverse_with_prefix 622. raise NoReverseMatch(msg)

Exception Type: NoReverseMatch at / Exception Value: Reverse for 'user-list' not found. 'user-list' is not a valid view function or pattern name.

Answer 1

reverse只接受以下参数：

reverse（viewname，urlconf = None，args = None，kwargs = None， current_app =无）

并且您的users/不接受任何参数，因此您只需要反向输入网址名称

reverse('user-list')

Answer 2

内部服务器错误：/ 追溯（最近一次通话）：内部文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ core \ handlers \ exception.py”，第34行响应= get_response（请求） _get_response中的文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ core \ handlers \ base.py”，第126行响应= self.process_exception_by_middleware（e，请求）文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ core \ handlers \ base.py”，第124行，_get_response 响应= wraped_callback（请求，* callback_args，** callback_kwargs）文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ views \ decorators \ csrf.py”，第54行，在wrapped_view中返回view_func（* args，** kwargs）视图中的文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ views \ generic \ base.py”，行68 返回self.dispatch（request，* args，** kwargs）在分派中的文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ views.py”，第505行响应= self.handle_exception（exc）在handle_exception中的第465行，文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ views.py” self.raise_uncaught_exception（exc）文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ views.py”，第476行，raise_uncaught_exception 提高经验派发文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ views.py”，第502行响应=处理程序（请求，* args，** kwargs）处理程序中的文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ decorators.py”，第50行 return func（* args，** kwargs）文件“ C：\ Users \ Ze Ran Lu \ Desktop \ swie \ text \ tutorials \ snippets \ views.py”，第205行，位于api_root中 '用户'：反向（'用户列表'），文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ reverse.py”，第47行，反过来 url = _reverse（viewname，args，kwargs，request，format，** extra）文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ rest_framework \ reverse.py”，第60行，_reverse url = django_reverse（viewname，args = args，kwargs = kwargs，** extra）文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ urls \ base.py”，第90行，反过来返回iri_to_uri（resolver._reverse_with_prefix（视图，前缀，* args，** kwargs））文件“ C：\ Anaconda3 \ envs \ python36 \ lib \ site-packages \ django \ urls \ resolvers.py”，第622行，_reverse_with_prefix 提高NoReverseMatch（msg） django.urls.exceptions.NoReverseMatch：找不到“用户列表”的反向。 “用户列表”不是有效的视图函数或模式名称。

Answer 3

另一个url.py文件是

from django.contrib import admin
from django.urls import path
from django.urls import include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('snippets.urls'))
]

Answer 4

项目结构

django.urls.exceptions.NoReverseMatch：找不到“用户列表”的反向。 “用户列表”不是有效的视图函数或模式名称

4 个答案: