使用名为"pk“的URL关键字参数调用视图Equation1View

Question

我试图从json中的请求体中直接获取数据。在Api中进行计算将是我的Django REST API的主要部分。在未来，我将添加一些数据库，我将从其中获得一些将用于计算的数据。

我对错误AssertionError: Expected view Equation1View to be called with a URL keyword argument named "pk". Fix your URL conf, or set the 'lookup_field' attribute on the view correctly.有个问题

我不知道应该把pk参数放在哪里。使用下面的api，我应该能够在请求体中发送{"name":"xxx", value:1.23}，并在json响应中获取{"emission":1.23}。当然，随着从请求体获取更多数据并将其与db中的数据连接起来，将来的工作将更加复杂，但现在我必须使它变得简单。

api urls.py：

from .views import Equation1View
from django.urls import path

urlpatterns = [
   path('equation/1', Equation1View.as_view())
   #path('equation/2'),
   #path('equation/3'), 
]

views.py

from aiohttp import request
from rest_framework import generics
from .serializers import EmissionSerializer, EquaSerializer

# Create your views here.
class Equation1View(generics.RetrieveAPIView):
    queryset = ''
    serializer_class = EquaSerializer(context={'request':request})

serializers.py

from rest_framework import serializers

class EquaSerializer(serializers.Serializer):
    emission = serializers.SerializerMethodField('perform_equation')

    def perform_equation(self):
        request = self.context.get("request")
        if request and hasattr(request, 'name') and hasattr(request, 'value'):
            return request.value

Answer 1

RetrieveAPIView是泛型api视图，用于从模型中检索特定数据，并且该数据是基于通过url传递的pk检索的，因此将urls.py更改为

from .views import Equation1View
from django.urls import path

urlpatterns = [
   path('equation/<int:pk>', Equation1View.as_view())
   #path('equation/2'),
   #path('equation/3'), 
]