Django Rest Framework:关联元素的URL [英] Django Rest Framework: URL for associated elements

问题描述

我已经创建了以下API端点，并且可以正常工作:

I have the following API endpoints already created and working fine:

urls.py:

router = DefaultRouter()

router.register(r'countries', views.CountriesViewSet,
                base_name='datapoints')
router.register(r'languages', views.LanguageViewSet,
                base_name='records')

现在，我需要创建一个新的终结点，在这里可以检索与一种语言关联的国家(假设一个国家只有一种关联语言).

Now, I need to create a new endpoint, where I can retrieve the countries associated with one language (let's suppose that one country has just one associated language).

为此，我将使用以下URL模式创建一个新的端点:

For that purpose, I would create a new endpoint with the following URL pattern:

/myApp/languages/<language_id>/countries/

如何用已经使用的 DefaultRouter 表示该模式?

How could I express that pattern with the DefaultRouter that I'm already using?

推荐答案

您可以受益于

You can benefit from DRF routers' extra actions capabilities and especially the @action method decorator:

from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from rest_framework.decorators import action
from rest_framework.generics import get_object_or_404

from .serializers import CountrySerializer


class LanguageViewSet(ModelViewSet):
    # ...

    @action(detail=True, methods=['get']):
    def countries(self, request, pk=None):
        language = get_object_or_404(Language, pk=pk)
        # Note:
        # In the next line, have in mind the
        # related_name
        # specified in models
        # between Country & Language
        countries = language.countries.all()
        # ___________________^

        serializer = CountrySerializer(countries, many=True)

        return Response(data=serializer.data)

有了这个，您当前的路由器规格应该保持不变，并且您已经注册了所需的路由.

Having this, your current router specification should stay the same and you will have your desired route already registered.

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