Question

我似乎无法在序列化程序的create方法中访问外键值。在提交POST以创建新实例时，我收到以下错误：

在/ api / v1 / organization / provider /上的DoesNotExist 服务匹配查询不存在。

回溯中的

如下：

创建文件“/code/classification/serializers.py” 114. thisService = Service.objects.get（name = validated_data.get（'service'））

POST数据如下： {service：“ServiceProvider1”，tenantIdentifier：“9f0e40fe-3d6d-4172-9015-4298684a9ad2”，已启用：true}

我的问题： 如何从ConnectedService模型（FK关系）基于其名称字段（而不是其PK）成功引用Service实例。我得到的错误是{“service”：[“类型不正确。预计pk值，收到str。”}}

根据以下建议我到目前为止尝试了什么：

试图查看我是否可以从validate（）方法中看到validated_data或数据。对于print（validated_data.get（'service'））和print（data.get（'service'））
更改序列化程序的代码以引用服务的FK。结果是 {“service”：[“类型不正确。预计pk值，收到str。”}}

models.py：

class Service(models.Model):
    name = models.CharField('provider name', max_length = 32)
    displayName = models.CharField('provider label display name', max_length = 32)
    helpText = models.TextField('Explanatory text about this provider', max_length = 140, blank=True)
    authzUrl = models.URLField('authorisation URL for service', max_length = 512, blank=True, null=True)
    appID = models.CharField('ID for this app as provided by cloud provider', max_length = 64, blank=True, null=True)
    def __str__(self):
        return self.displayName

class ConnectedService(models.Model):
    service = models.ForeignKey(Service, related_name='connected')
    tenantIdentifier = models.CharField('Tenant identifer for organisation', max_length = 128, null=True, blank=True)
    enabled = models.BooleanField(default=True)
    organisation = models.ForeignKey('Organisation', blank=True, null=True) #string reference used as a lazy reference for Organisation

serializers.py（已更新）：

class ConnectedServiceSerializer(serializers.ModelSerializer):
class Meta:
    model = ConnectedService
    fields = ('tenantIdentifier', 'enabled', 'service', 'organisation' )

def validate(self, data):
    #check there is no existing option for this service + organisation combination
    try:
        thisOrganisation = Organisation.objects.get(pk= self.context['request'].user.organisation_id)
        thisService = Service.objects.get(name=validated_data.get('service'))
        thisConnectedService = ConnectedService.objects.get(service=thisService, organisation= thisOrganisation)
        raise serializers.ValidationError('This service is already registered for this organisation')
    except:
        pass
    return data

    def create(self,validated_data):
    thisOrganisation = Organisation.objects.get(pk= self.context['request'].user.organisation_id)
    thisService = Service.objects.get(name=validated_data.get('service'))
    thisConnectedService = ConnectedService()
    thisConnectedService.organisation = thisOrganisation
    thisConnectedService.service = thisService
    thisConnectedService.enabled = True
    thisConnectedService.save()
    return thisConnectedService

views.py

class ConnectedService(mixins.RetrieveModelMixin,generics.GenericAPIView, mixins.CreateModelMixin):
    queryset = ConnectedService.objects.all()
    serializer_class = ConnectedServiceSerializer


def get(self, request, *args, **kwargs):
    return self.retrieve(request, *args, **kwargs)

def post(self, request, *args, **kwargs):
    return self.create(request, *args, **kwargs)

无法访问序列化程序的create（）方法中的验证数据或FK关系

0 个答案: