当我想使用 get_serializer_class() 根据 url 参数为不同的用户返回不同的字段时，django-rest-swagger 不起作用

Question

我正在使用 django-rest-swagger 来生成 api 文档。我想返回不同的用户模型的不同部分。所以我使用了 get_serializer_class()通过检查 kwargs['pk'] 为不同用户使用不同序列化程序的功能在网址上。
urls.py是:

url(r'^api/users/$', views.UserEnum.as_view()),
url(r'^api/users/(?P<pk>[0-9]+)/$', views.UserDetail.as_view()),

我正在使用的 View 是:

#List all the users or create a new user
class UserEnum(generics.ListCreateAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer
    permission_classes = (IsAuthenticated, IsAdminUser,)

class UserDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = User.objects.all()
    #serializer_class = UserSerializer #TODO: Problem with Swagger
    permission_classes = (IsAuthenticated, IsOwnerAdminOrReadOnly,)

    def get_serializer_class(self):
        #swagger crash here.
        user_id = int(self.kwargs['pk'])
        if self.request.user.id == user_id or self.request.user.is_superuser:
            serializer_class = UserSerializer
        else:
            serializer_class = UserProfileSerializer
        return serializer_class

    def get_object(self, *args, **kwargs):
        user_id = int(self.kwargs['pk'])

        if self.request.user.id == user_id or self.request.user.is_superuser:
            return User.objects.get(id=user_id)
        else:
            return UserProfile.objects.get(user=user_id)

我使用的序列化器类是:

class UserProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserProfile
        fields = ('photo', 'description', 'birthday', 'credit',)

class UserSerializer(serializers.ModelSerializer):
    profile = UserProfileSerializer()

    class Meta:
        model = User
        fields = ('id', 'last_login', 'username', 'email', 'date_joined', 'profile', )
        ...

UserProfile是:

class UserProfile(models.Model):
    user = models.OneToOneField(User, primary_key=True, related_name="profile")
    photo = models.ImageField(upload_to='user_photo', null=True, blank=True)
    description = models.TextField(blank=True)
    birthday = models.DateTimeField(blank=True)
    credit = models.PositiveIntegerField()

    def __unicode__(self):
        return u'%s' % (self.user.username)

上述两个网址成功运行没有问题。 (或者谁能告诉我根据url参数为不同用户返回不同字段的正确方法？)但是当我输入 http://127.0.0.1:8000/api/ 时对于生成 api 文档，它返回以下错误:
Unable to read api 'users' from path http://127.0.0.1:8000/api/api-docs/api/users (server returned Internal Server Error)
所以我测试了 http://127.0.0.1:8000/api/api-docs/api/users独自一人，我得到了更多详细信息的错误提示:

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/api/api-docs/api/users

Django Version: 1.6.5
Python Version: 2.7.8
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'south',
 'rest_framework',
 'rest_framework_swagger',
 'django_extensions',
 '***')
Installed Middleware:
('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')


Traceback:
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  112.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
  57.         return view_func(*args, **kwargs)
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/django/views/generic/base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  407.             response = self.handle_exception(exc)
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  404.             response = handler(request, *args, **kwargs)
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/views.py" in get
  119.             'apis': generator.generate(apis),
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/docgenerator.py" in generate
  32.                 'operations': self.get_operations(api, apis),
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/docgenerator.py" in get_operations
  68.             serializer = self._get_method_serializer(method_introspector)
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/docgenerator.py" in _get_method_serializer
  165.         serializer = method_inspector.get_response_serializer_class()
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/introspectors.py" in get_response_serializer_class
  203.             serializer = self.get_serializer_class()
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/introspectors.py" in get_serializer_class
  196.             serializer = self.ask_for_serializer_class()
File "/Users/Scofield/anaconda/lib/python2.7/site-packages/rest_framework_swagger/introspectors.py" in ask_for_serializer_class
  179.                 return view.get_serializer_class()
File "/Users/Scofield/Dropbox/My Projects/Angels&Demons/src/doWishSites/doWishCore/views.py" in get_serializer_class
  27.         user_id = int(self.kwargs['pk'])

Exception Type: KeyError at /api/api-docs/api/users
Exception Value: 'pk'

Answer 1

尝试强奸访问 self.kwargs['pk'] 的代码
使用 try 和 except 块

   def get_serializer_class(self):
        # swagger crash here.
        try:
            user_id = int(self.kwargs['pk'])
        except Exception as e:
            print(e)
        if self.request.user.id == user_id or self.request.user.is_superuser:
            serializer_class = UserSerializer
        else:
            serializer_class = UserProfileSerializer
        return serializer_class

来源 https://github.com/marcgibbons/django-rest-swagger/issues/194