Question

我在为汽车创建新评级时遇到问题。当我尝试从邮递员发送发帖请求以为特定汽车创建/添加新评级时，出现错误：

The `.create()` method does not support writable nested fields by default.

这些是我的模特

class Car(models.Model):
name = models.CharField(max_length=50)
symbol = models.CharField(max_length = 5)

def __str__(self):
    return self.name


class Type(models.Model):
    name = models.CharField(max_length = 50)
    fuel = models.CharField(max_length = 1)##1 or 2 for fuel type
    car = models.ManyToManyField(Car)

    def __str__(self):
        return self.name

class Rating(models.Model):
    rating = models.IntegerField(validators=[
            MaxValueValidator(10),
            MinValueValidator(0)
        ])
    car = models.ForeignKey(Car, on_delete=models.CASCADE)
    type = models.ForeignKey(Type, on_delete=models.CASCADE)

    def __int__(self):
        return self.rating

我的序列化器：

class CarSerializer(serializers.ModelSerializer):
class Meta:
    model = Car
    fields = ('id','name')

class TypeSerializer(serializers.ModelSerializer):
    car = CarSerializer(many=True)
    class Meta:
        model = Type
        fields = ('id','name', 'fuel', 'car')
        #depth=2

class RatingSerializer(serializers.ModelSerializer):
    type = TypeSerializer()
    class Meta:
        model = Rating
        fields = ('id','rating', 'car', 'type')

    def create(self, validated_data):
    type_data = validated_data.pop('type')
    rating = Rating.objects.create(**validated_data)
    for t_data in type_data:
        Type.objects.create(rating=rating, **t_data)
    return rating

当我尝试发布帖子以进行评分时，例如：

{"rating":5, "car": 2,"type":{"id":1,"name":"OffRoad","fuel":"1","car":[{"id":2,"name":"Ford"}] } }

我得到：

The `.create()` method does not support writable nested fields by default.

如果可以的话，请尽量提供帮助。谢谢！

如何修复Django API中的“ .create（）方法默认情况下不支持可写嵌套字段”

0 个答案: