Django-rest：发送 POST 带有 2 个外键的请求

Question

我想 post 序列化器中的数据，有 2 个外键。
我有这些型号：

class Child(models.Model):
    first_name = models.CharField(max_length=40)
    description = models.CharField(max_length=40)

class Parent(models.Model):
    name = models.CharField(max_length=20)
    pet = models.ForeignKey(pet)
    child = models.ForeignKey(Child, related_name='boys')

class Pet(models.Model):
    kind = models.CharField(max_length=40)
------------------,
Class PetSerializer(ModelSerializer):
    class Meta:
        model = Pet
        fields = ('kind',)

class ParentSerializer(ModelSerializer):    
    pet = PetSerializer(many=True): 
    class Meta:
        model = Parent
        fields = ('name', 'pet')

class ChildSerializer(ModelSerializer):
    boys = ParentSerializer() 

    class Meta:
        model = Child
        fields = ('first_name', 'boys')

我的第一个问题：是否有可能得到如下输出：

{
    "first_name": "Peter",
    "boys": [
      {
        "name": "Bill",
         "kind": "dog"
        }
      ]
   }

我的第二个 question:And 我正在尝试使用以下方法发送数据以创建新模型：




    def create(self, validated_data):
        clean_data = validated_data.pop('boys')
        child = Child.objects.create(**validated_data)
        for data in clean_data:
            Parent.objects.create(child=child, **data)
        return child
But I got this error: TypeError: Direct assignment to the reverse side of a related set is prohibited. Use boys.set() instead.

Answer 1

关于您的第一个问题，您可以在 ParentSerializer class:

中使用 source parameter

class ParentSerializer(ModelSerializer):    
    kind = serializers.CharField(source='pet.kind'): 
    class Meta:
        model = Parent
        fields = ('name', 'kind')

Django-rest：发送 POST 带有 2 个外键的请求

Django-rest :send POST request with 2 foreign key

serialization

foreign-keys

django-rest-framework

django-rest-viewsets