Django REST框架中如何从另一个视图调用API视图

发布于06月28日

我正在try 从另一个APIView呼叫APIView，代码类似于:

A.views.py个


from rest_framework import views
from rest_framework.response import Response


class A(views.APIView):

   def post(self, request, *args, **kwargs):

       return Response({"message": "class A"})

B.views.py个


from rest_framework import views
from rest_framework.response import Response

from A.views import A

class B(views.APIView):

   def post(self, request, *args, **kwargs):

       http_response = <call_A_APIView>

       return Response({"message": http_response})

我已经try 了下面的代码行:

http_response = A.as_view()(request._request)

但提出以下例外:

读取请求数据流后不能访问Body

你知道怎么做才是正确的吗？

推荐答案

问题不在代码中，奇怪的是，我只需要重新运行Django服务器，代码就会按预期执行，所以B.views.py将是:


from rest_framework import views
from rest_framework.response import Response

from A.views import A

class B(views.APIView):

   def post(self, request, *args, **kwargs):

       http_response = A.as_view()(request._request)

       return Response(http_response.data)

UPDATE个

似乎HttpRequest AKA request._request在被Django REST FrameworkView解析器类读取后不能被多次使用，这将导致调用read方法，这将把_request对象的属性_read_started更改为True，之后如果您试图使用request.data或request._request将引发上面所示的异常，因为request.body不再是可访问的，因为它依赖于_read_started属性的值，更不用说HttpRequest的值已经被转换成stream对象并存储在内存中.

SOLUTION个

我发现了多个建议:

1-使用Middleware存储request.body，以备将来需要时使用.

2-使用自定义解析器类，在将原始数据转换为stream对象之前，将原始数据作为属性存储在request对象中.

我发现它们都有点复杂，所以我更改了从特定DRF View呼叫另一个APIView的方式，如下所示:


from rest_framework import views, status
from rest_framework.response import Response

from A.views import A
from C.views import C

class B(views.APIView):

   def post(self, request, *args, **kwargs):

       # Initialize a new instance of class view 'A'  
       a_view = A()

       # Calling HTTP 'POST' method with DRF request object.
       a_http_response = a_view.post(request)

       if a_http_response.status_code == status.status.HTTP_200_OK:

          # Initialize a new instance of class view 'C'  
          c_view = C()

          # Another calling HTTP 'POST' method with DRF request object.
          c_http_response = c_view.post(request)

          return(c_http_response.data)
       
       else:
          return Response(a_http_response.data)