Orders在我的 django 應用程序中，我在和之間建立了多對多關(guān)系Packages。一個訂單可以有多個包裹。我想了解更新和創(chuàng)建方法模型.pyclass Package(models.Model): prod_name = models.CharField(max_length=255, default=0) quantity = models.IntegerField(default=0) unit_price = models.IntegerField(default=0)class Orders(models.Model): order_id = models.CharField(max_length=255, default=0) package = models.ManyToManyField(Package) is_cod = models.BooleanField(default=False)序列化程序.pyclass PackageSerializer(serializers.ModelSerializer): class Meta: model = Package fields = "__all__"class OrderSerializer(serializers.ModelSerializer): package = PackageSerializer(many=True) class Meta: model = Orders fields = "__all__"視圖.pyclass OrdersCreateAPIView(generics.CreateAPIView): permission_classes = (permissions.IsAuthenticated,) serializer_class = OrderSerializer def post(self, request): serializer = OrderSerializer(data=request.data) if serializer.is_valid(): serializer.save() return Response(serializer.data, status=status.HTTP_201_CREATED) return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)這足以處理相關(guān)數(shù)據(jù)嗎？我正在嘗試了解ManytoManyDjango 和 DRF 中的關(guān)系，所以請解釋我是否需要更改模型或視圖更新：我已經(jīng)更新了我的序列化程序和視圖，以便創(chuàng)建manytomany像這樣的相關(guān)對象：class OrderSerializer(serializers.ModelSerializer): package = PackageSerializer(many=True) class Meta: model = Orders fields = "__all__" def create(self, validated_data): package_data = validated_data.pop('package') pkgs = [] order = Orders.objects.create(**validated_data) for i in package_data: try: p = Package.objects.create(**i) pkgs.append(p) except: pass order.package.set(pkgs) return order但是我仍然不清楚覆蓋update. RetrieveUpdateDestroyAPIView另外，上述方法是存儲M2M相關(guān)對象的正確方法嗎？請幫助更新序列化程序的部分，我知道我必須在序列化程序中傳遞查詢
1 回答
慕姐8265434
TA貢獻1813條經(jīng)驗 獲得超2個贊
工作代碼庫
#serializers.py
class PackageSerializer(serializers.ModelSerializer):
id = serializers.IntegerField()
class Meta:
model = Package
fields = "__all__"
class OrderSerializer(serializers.ModelSerializer):
package = PackageSerializer(many=True)
def get_or_create_packages(self, packages):
package_ids = []
for package in packages:
package_instance, created = Package.objects.get_or_create(pk=package.get('id'), defaults=package)
package_ids.append(package_instance.pk)
return package_ids
def create_or_update_packages(self, packages):
package_ids = []
for package in packages:
package_instance, created = Package.objects.update_or_create(pk=package.get('id'), defaults=package)
package_ids.append(package_instance.pk)
return package_ids
def create(self, validated_data):
package = validated_data.pop('package', [])
order = Orders.objects.create(**validated_data)
order.package.set(self.get_or_create_packages(package))
return order
def update(self, instance, validated_data):
package = validated_data.pop('package', [])
instance.package.set(self.create_or_update_packages(package))
fields = ['order_id', 'is_cod']
for field in fields:
try:
setattr(instance, field, validated_data[field])
except KeyError: # validated_data may not contain all fields during HTTP PATCH
pass
instance.save()
return instance
class Meta:
model = Orders
fields = "__all__"
#views.py
class OrderViewSet(viewsets.ModelViewSet):
serializer_class = OrderSerializer
queryset = Orders.objects.all()
DefaultRouter在as的幫助下注冊此視圖，
from rest_framework.routers import DefaultRouter
router = DefaultRouter()
router.register(r'order', OrderViewSet, basename='order')
urlpatterns = [
] + router.urls
因此，您將獲得該表中描述的基本 CRUD 端點（參見DefaultRouter參考文獻）。
讓您的訂單列表端點成為/foo-bar/order/
HTTP POST 來
/foo-bar/order/創(chuàng)建一個新實例HTTP PUT 或 HTTP PATCH
/foo-bar/order/<ORDER_PK>/以更新內(nèi)容
筆記
在這種情況下，id如果您希望將現(xiàn)有的包關(guān)系映射到Order
更新-1
您可以像這樣連接視圖
urlpatterns = [
path('foo/order/', OrderViewSet.as_view({'post': 'create'})), # create new Order instance
path('foo/order/<int:pk>/', OrderViewSet.as_view({'patch': 'partial_update'})), # update Order instance
]
注意：這僅支持HTTP POST和HTTP PATCH
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