我有两个具有多对多关系的模型, 我正在尝试将嵌套数据发送到我的API。不幸的是,它只给了我一个空数组。
这是我正在尝试的:
我的模特:
class Building(models.Model):
name = models.CharField(max_length=120, null=True, blank=True)
net_leased_area = models.FloatField(null=True, blank=True)
class BuildingGroup(models.Model):
description = models.CharField(max_length=500, null=True, blank=True)
buildings = models.ManyToManyField(Building, default=None, blank=True)
我的通用API视图:
class BuildingGroupCreateAPIView(CreateAPIView):
queryset = BuildingGroup.objects.all()
serializer_class = BuildingGroupSerializer
我的序列化器:
class BuildingGroupSerializer(serializers.ModelSerializer):
buildings = BuildingSerializer(many=True)
class Meta:
model = BuildingGroup
fields = (
'description',
'buildings',
)
def create(self, validated_data):
buildings_data = validated_data.pop('buildings')
building_group = BuildingGroup.objects.create(**validated_data)
for building_data in buildings_data:
Building.objects.create(building_group=building_group, **building_data)
return building_group
当我发送数据时,它返回以下内容:
{"description":"Test Description API","buildings":[]}
在数组中,我希望有我的字典数组。
当我覆盖create方法以发送嵌套对象时,我尝试遵循REST文档。 (https://www.django-rest-framework.org/api-guide/relations/#writable-nested-serializers),我以为我做得正确,但是史诗失败。
我使用这样的自定义方法通过请求发送数据:
test_api_local(method="post", data={
"description": "Test Description API",
"buildings": [{'name' : 'Testname'}, .... ],
})
我们非常感谢您的帮助。非常感谢!
编辑:当我尝试在REST视图上对其进行测试时,它会告诉我:
TypeError: 'building_group' is an invalid keyword argument for this function
EDIT2:这是我的观点:
class BuildingGroupCreateAPIView(CreateAPIView):
queryset = BuildingGroup.objects.all()
serializer_class = BuildingGroupSerializer
def create(self, request, *args, **kwargs):
serializer = BuildingGroupSerializer(data=self.request.data)
serializer.is_valid(raise_exception=True)
serializer.save()
return Response(serializer.data)
答案 0 :(得分:1)
您必须根据有效负载数据中传递的ID显式获取或创建Building
实例,然后将它们添加到BuildingGroup
实例中。
class NestedBuildingSerializer(serializers.ModelSerializer):
id = serializers.IntegerField(required=False)
class Meta:
model = Building
fields = '__all__'
class BuildingGroupSerializer(serializers.ModelSerializer):
buildings = NestedBuildingSerializer(many=True)
class Meta:
model = BuildingGroup
fields = (
'description',
'buildings',
)
def create(self, validated_data):
buildings_data = validated_data.pop('buildings')
building_group = BuildingGroup.objects.create(**validated_data)
buildings = [] # it will contains list of Building model instance
for building_data in buildings_data:
building_id = building_data.pop('id', None)
building, _ = Building.objects.get_or_create(id=building_id,
defaults=building_data)
buildings.append(building)
# add all passed instances of Building model to BuildingGroup instance
building_group.buildings.add(*buildings)
return building_group
class BuildingGroupView(ListAPIView, CreateAPIView):
queryset = BuildingGroup.objects.all()
serializer_class = BuildingGroupSerializer
## Assume you add your views like this in urls.py
urlpatterns = [
.....
path('building-groups', views.BuildingGroupView.as_view(),
name='building-group'),
.....
]
以 POST 方法调用端点/building-groups
时,其有效载荷如下:
{
"description": "here description",
"buildings": [
{
"id": 1, # existing building of id 1
"name": "name of building 1",
"net_leased_area": 1800
},
{
# a new building will gets create
"name": "name of building 2",
"net_leased_area": 1800
}
]
}
然后,它将返回如下响应:-
{
"description": "here description",
"buildings": [
{
"id": 1,
"name": "name of building 1",
"net_leased_area": 1800
},
{
"id": 2
"name": "name of building 2",
"net_leased_area": 1800
}
]
}
了解有关M2M relationship的信息
并且.get_or_create()
注意:
BuildingSerializer
和NestedBuildingSerializer
都不同。不要把它们混在一起。