使用 django-simple-history 和 DRF 时，如何创建额外的操作来访问对象的历史记录？

Question

我是 Python、Django 和 DRF 的新手，但我已经阅读了设置基本 REST 服务器所需的所有教程，对于这个示例，我们假设它只提供一件事：客户列表.此外，我已经安装了django-simple-history 并用它注册了我的Customer 模型。

这是我迄今为止编写的代码，一切似乎都运行良好。

api/urls.py

from django.urls import path, include
from rest_framework import routers
import api.views as views

router = routers.DefaultRouter(trailing_slash=False)

router.register('customers', views.CustomerView)
router.register('customerhistory', views.CustomerHistoryView)

urlpatterns = [
    path('', include(router.urls)),
]

api/views.py

from rest_framework import viewsets
from retail.models.customers import Customer

class CustomerView(viewsets.ModelViewSet):
    queryset = Customer.objects.all()
    serializer_class = CustomerSerializer
    filterset_fields = '__all__'
    search_fields = ['name']


class CustomerHistoryView(viewsets.ModelViewSet):
    queryset = Customer.history.all()
    serializer_class = CustomerHistorySerializer
    filterset_fields = '__all__'

api/serializers.py

from rest_framework import serializers
from retail.models.customers import Customer

class CustomerSerializer(serializers.ModelSerializer):
    class Meta:
        model = Customer
        fields = '__all__'


class CustomerHistorySerializer(serializers.ModelSerializer):
    class Meta:
        model = Customer.history.model
        fields = '__all__'

事实上，当我转到 api/customerhistory/1 时，它给了我一个可爱的客户 1 历史记录列表。

问题

我想做的是通过转到api/customer/1/history 来访问同一个列表。

到目前为止我的尝试......

为此，我将删除 CustomerHistoryView 并向 CustomerView 类添加一个额外的操作。

api/views.py

from rest_framework import viewsets
from rest_framework.decorators import action
from rest_framework.response import Response
from retail.models.customers import Customer

class CustomerView(viewsets.ModelViewSet):
    queryset = Customer.objects.all()
    serializer_class = CustomerSerializer
    filterset_fields = '__all__'
    search_fields = ['name']

    @action(detail=True)
    def history(self):
        history = Customer.history.all()
        serializer = CustomerHistorySerializer(history, many=True)
        return Response(serializer.data)

这会产生以下错误：

Exception Type: TypeError at /api/customers/1/history
Exception Value: history() got multiple values for argument 'pk'

我做错了什么？

Answer 1

您的 history 方法似乎缺少参数。

Here are the docs for extra actions on viewsets.

@action(detail=True)
def history(self, request, pk=None):
    history = Customer.history.all()
    # ...

注意request 和pk=None 到history 的额外参数。