Question

我正在尝试在/path/to/API/widget/1/的Django Rest Framework 3.6.3中检索模型实例，1是小部件的主键。它给了我：

retrieve（）得到了一个意外的关键字参数'pk'

从跟踪中我认为我正在做一些事情导致dispatch在实例化处理程序时抛出异常（来自views.py，source here）。当我检查来源时，我不明白我做错了什么。这是跟踪：

回溯：

File "/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/lib/python3.5/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/lib/python3.5/site-packages/django/views/decorators/csrf.py" in wrapped_view
  58.         return view_func(*args, **kwargs)

File "/lib/python3.5/site-packages/rest_framework/viewsets.py" in view
  86.             return self.dispatch(request, *args, **kwargs)

File "/lib/python3.5/site-packages/rest_framework/views.py" in dispatch
  489.             response = self.handle_exception(exc)

File "/lib/python3.5/site-packages/rest_framework/views.py" in handle_exception
  449.             self.raise_uncaught_exception(exc)

File "/lib/python3.5/site-packages/rest_framework/views.py" in dispatch
  486.             response = handler(request, *args, **kwargs)

Exception Type: TypeError at /path/to/API/widget/1/
Exception Value: retrieve() got an unexpected keyword argument 'pk'

以下是ViewSet：

的观点

def retrieve(self, request, some_lookup_field=None):
    instance = self.get_object(pk) # handle multi-tenant access control
    if not instance:
        return Response(status=status.HTTP_404_NOT_FOUND)
    serializer = self.get_serializer(instance) # from the class's `serializer_cass` attribute
    return Response(serializer.data)

Answer 1

正如您在堆栈跟踪中看到的那样，错误是：

retrieve()收到了意外的关键字参数'pk'。

仔细查看retrieve()函数：

def retrieve(self, request, some_lookup_field=None):
    # ____________________________^
    instance = self.get_object(pk) # handle multi-tenant access control
    # _________________________^
    ...

您将some_lookup_field作为参数而非pk，您在self.get_object(pk)中使用了以下内容。尝试将some_lookup_field重命名为pk。

DRF请求处理程序抛出异常：retrieve（）得到一个意外的关键字参数'pk'

1 个答案: