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创建订单时,序列化程序的django-create方法,给出一个名为Country的错误Country已存在

django-rest-framework serialization

Ð ÑÑÐ»Ð°Ð½ ÐÑÑÑÐ°ÐºÐ¾Ð² · 技术社区 · 1 年前

我有一个订单模型,当在序列化程序的create方法中创建条目时,我试图将一个国家添加到many-many字段,但我得到了一个错误:一个名为country的国家已经存在

我有模型:

class Order(models.Model):
    name = models.CharField(max_length=150)
    description = models.TextField()
    price = models.DecimalField(max_digits=10, decimal_places=2, default=0, blank=True, null=True)
    created_at = models.DateTimeField(auto_now_add=True)
    period = models.DateField(_('Ð¡ÑÐ¾Ðº Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð¸Ñ'), blank=True, null=True)
    specialization = models.ForeignKey(to='categories.Specialization', on_delete=models.PROTECT, related_name='order_specializations')
    country = models.ManyToManyField(Country, related_name='countries', blank=True)
    
    slug = models.SlugField(max_length=255)
    customer = models.ForeignKey(User,verbose_name=_("ÐÐ°ÐºÐ°Ð·ÑÐ¸Ðº"), on_delete=models.CASCADE, related_name='order_customers')


class Country(models.Model):
    name = models.CharField(max_length=150, unique=True)
    phone_code = models.CharField(max_length=15, blank=True, null=True)
    flag = models.FileField(upload_to='flags/', null=True, blank=True)
    
    region = models.ForeignKey(Region, on_delete=models.PROTECT, related_name='countries')

serializers.py

class OrderCreateSerializer(serializers.ModelSerializer):
    specialization_id = serializers.IntegerField()

    class Meta:
        model = Order
        fields = ['id', 'name', 'description', 'price', 'created_at', 'specialization_id', 'slug', 'customer', 'file1', 'file2', 'file3', 'country']
        read_only_fields = ['customer', 'slug']
    
    country = CountryOrderSerializer(many=True)
    
    
    def create(self, validated_data):
        user = self.context['request'].user
        price = validated_data.get('price', 0)
        country_data = validated_data.pop('country', [])
        if check_customer_balance(customer=user, currency=currency, price=price):
            name = validated_data.get('name')
            specialization_id = validated_data.pop('specialization_id')
            validated_data['specialization'] = Specialization.objects.get(id=specialization_id)
            order = super().create(validated_data)
            create_order_transfer_money(user, currency, price, order)
        else:
            return Response({'error': 'Not enough funds'})
        for country_info in country_data:
            try:
                country = Country.objects.get(**country_info)
                order.country.add(country_info)
            except Country.DoesNotExist:
                return Response({'error': 'Country does not exist'})
        return order

当我发送邮件请求时

{
    "name": "order3",
    "description": "ordeadadasd",
    "specialization_id": 1,
    "country": [{"name": "test"}]   
}

create方法甚至没有开始工作。我得到了一个错误:一个名为country的国家已经存在在我看来,有人试图写入Country表,但它应该添加到与订单相关的表中。根本没有必要在Country表中写任何内容请帮忙!)

1 回复 | 直到 1 年前

willeM_ Van Onsem 1 年前

将子序列化程序标记为只读。序列化程序应该不构造响应,序列化程序构造对象。

您还应该在验证器中进行验证,而不是创建方法:

class OrderCreateSerializer(serializers.ModelSerializer):
    specialization_id = serializers.IntegerField()

    class Meta:
        model = Order
        fields = [
            'id',
            'name',
            'description',
            'price',
            'created_at',
            'specialization_id',
            'slug',
            'customer',
            'file1',
            'file2',
            'file3',
            'country',
        ]
        read_only_fields = ['customer', 'country', 'slug']

    country = CountryOrderSerializer(many=True, read_only=True)

    def validate(self, data):
        user = self.context['request'].user
        if not check_customer_balance(
            customer=user, currency=currency, price=data.get('price', 0)
        ):
            raise serializers.ValidationError('Not enough funds')
        country_data = self.initial_data.get('country', [])
        countries = Country.objects.get(
            name__in=[country['name'] for country in country_data]
        )
        if len(countries) != len(country_data):
            raise serializers.ValidationError('Invalid countries.')
        return data

    def create(self, validated_data):
        order = super().create(validated_data)
        create_order_transfer_money(user, currency, price, order)
        order.country.add(
            *Country.objects.filter(
                name__in=[
                    country['name']
                    for country in self.initial_data('country', [])
                ]
            )
        )
        return order