在 Django DRF 中，我总是在序列化程序的更新方法中得到 ValueError

Question

我正在使用 Django DRF，并且我已经在我的序列化程序中成功创建了创建方法，但是不知何故，更新方法并没有像我想要的那样工作。我总是得到相同的 ValueError。

我的模特：

class User(models.Model):
gender = models.CharField(max_length=10, choices=GENDER, default='Male')
first_name = models.CharField(max_length=20)
last_name = models.CharField(max_length=20)
position = models.CharField(max_length=50)
birthday = models.DateField(auto_created=False, null=True)
email = models.EmailField(max_length=50)
phone = models.CharField(max_length=15)
password = models.CharField(max_length=100, null=True)


class Company(models.Model):
company_name = models.CharField(max_length=50, blank=False)
address = models.CharField(max_length=50, blank=False)
zip = models.IntegerField(blank=False)
city = models.CharField(max_length=50, blank=False)
email = models.EmailField(max_length=50, blank=False)


class PartnerCompany(models.Model):
partner = models.ForeignKey(Company, on_delete=models.PROTECT)
contact_person = models.ForeignKey(User, on_delete=models.CASCADE)

我的序列化程序

class PartnerCompanySerializer(serializers.ModelSerializer):
partner = CompanySerializer(many=False)
contact_person = ClientUserSerializer(many=False)

class Meta:
    model = PartnerCompany
    fields = '__all__'

def create(self, validated_data):
    partner = validated_data.pop('partner')
    contact_person = validated_data.pop('contact_person')
    partner_instance = Company.objects.create(**partner)
    contact_person_instance = User.objects.create(**contact_person)
    return PartnerCompany.objects.create(partner=partner_instance,
                                         contact_person=contact_person_instance,
                                         **validated_data)


def update(self, instance, validated_data):
    instance.partner = validated_data.get('partner', instance.partner)
    instance.contact_person = validated_data.get('contact_person', instance.contact_person)
    partner_instance = Company.objects.update(**instance.partner)
    instance.save(partner_instance)
    return instance

我的看法：

class PartnerCompanyUpdateByID(generics.RetrieveUpdateAPIView):
lookup_field = 'id'
queryset = PartnerCompany.objects.all()
serializer_class = PartnerCompanySerializer

我总是得到这个 ValueError:

ValueError at /partner/update/id/6 Cannot assign "OrderedDict([('company_name', 'UBS Switzerland'), ('address', 'Mainstreet 1'), ('zip', 4102), ('city', 'Basel'), ('email', 'ubs@ubs.ch')])": "PartnerCompany.partner" must be a "Company" instance.

Answer 1

您不应将 partner_instance 作为 instance.save() 中的参数发送。 instance 已经在 partner.

中有了新值

def update(self, instance, validated_data):
    instance.partner = validated_data.get('partner', instance.partner)
    instance.contact_person = validated_data.get('contact_person', instance.contact_person)
    partner_instance = Company.objects.update(**instance.partner)
    instance.partner = partner_instance
    instance.save()
    return instance

在 Django DRF 中，我总是在序列化程序的更新方法中得到 ValueError

In Django DRF I always get the ValueError in my update method in my serializer

python

django

django-models

django-views

django-serializer