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Django Rest框架:如何实现嵌套逻辑?

django-views django-rest-framework django-models django python

Sreekanth Reddy Balne · 技术社区 · 6 年前

假设我有三个模型:

class User(AppModel):
    name = models.CharField(max_length=255)

class Business(AppModel):
    owner = models.ForeignKey("User", related_name="businesses", on_delete=models.CASCADE)
    legal_name = models.CharField(max_length=255)

class Invoice(AppModel):
    business = models.ForeignKey("Business", related_name="invoices", on_delete=models.CASCADE)
    amount = models.integerField()

如你所见,一个 user 可以有多个 businesses 和一个 business 可以有多个 invoices

我的序列化程序.py:

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields= ('name')

class BusinessSerializer(serializers.ModelSerializer):
    owner = UserSerializer(many=False)
    class Meta:
        model = Business
        fields= ('owner','legal_name')

class InvoiceSerializer(serializers.ModelSerializer):
    business= BusinessSerializer(many=False)
    class Meta:
        model = Invoice
        fields= ('business','amount')

视图.py:

class UserViewSet(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer

class BusinessViewSet(viewsets.ModelViewSet):
    queryset = Business.objects.all()
    serializer_class = BusinessSerializer

class InvoiceViewSet(viewsets.ModelViewSet):
    queryset = Invoice.objects.all()
    serializer_class = InvoiceSerializer

router = DefaultRouter()
router.register('user', UserViewSet, base_name='users')
router.register('business', BusinessViewSet, base_name='businesses')
router.register('invoice', InvoiceViewSet, base_name='invoices')
urlpatterns = router.urls

http://example.com/api/user 返回所有用户。没问题。

http://example.com/api/business/ 退货

[ { "legal_name": "1business", "owner": 1, }, { "legal_name": "2business", "owner": 1, },]
http://example.com/api/business/1/ 退货

{ "legal_name": "1business", "owner": 1, }

以上都可以。但我也需要:

http://example.com/api/business/1/invoices/

[ { "business": 1, "amount": 100, }, { "business": 1, "amount": 999, },]

以及我应该能够创建更新删除这些发票那里。

有什么帮助吗?我是django rest框架的新手。以上的课程只是一个例子。忽略错误。

2 回复 | 直到 6 年前

uedemir 6 年前

你应该使用django装饰器 @list_route 和 @detail_route 为您的视图集。但是要小心你的DRF版本。因为那些装饰师合并成了 @action 在DRF 3.8+中。这是你的名字 announcement .

from rest_framework.decorators import action
from rest_framework.response import Response
from rest_framework import status


class BusinessViewSet(viewsets.ModelViewSet):
    queryset = Business.objects.all()
    serializer_class = BusinessSerializer

    @action(detail=True, methods=["GET"], url_path="invoices")
    def invoices(self, request, pk=None):
        """
         Your codes comes here to return related result.
         pk variable contains the param value from url.
         if you do not specify the url_path properties then action will accept the function's name as url path.
        """
        entity = Invoice.objects.filter(business=pk)
        serializer = self.get_serializer(entity, many=True)
        return Response(serializer.data, status=status.HTTP_200_OK)

http://example.com/api/business/{{PK}}/invoices/
http://example.com/api/business/1/invoices/
http://example.com/api/business/3/invoices/
http://example.com/api/business/23/invoices/

@actions 从…起 documentation

别忘了在代码中控制空实体结果。您应该返回正确的响应和正确的状态代码。