Question

我正在尝试填充嵌套对象字段，但是返回的唯一内容是每个对象的主键（下面的输出）：

{
    "name": "3037",
    "description": "this is our first test product",
    "components": [
        1,
        2,
        3,
        4
    ]
}

如何填充组件模型的字段（而不仅仅是PK）？我想包括名称和说明。

models.py

class Product(models.Model):
    name = models.CharField('Bag name', max_length=64)
    description = models.TextField ('Description of bag',  max_length=512, blank=True)
    urlKey = models.SlugField('URL Key', unique=True, max_length=64)  
    def __str__(self):
        return self.name

class Component(models.Model):
    name = models.CharField('Component name', max_length=64)
    description = models.TextField('Component of product',  max_length=512, blank=True)
    fits = models.ForeignKey('Product', related_name='components')
    def __str__(self):
        return self.fits.name + "-" + self.name

serializers.py

from rest_framework import serializers
from app.models import Product, Component, Finish, Variant

class componentSerializer(serializers.ModelSerializer):
    class Meta:
    model = Component
    fields = ('name', 'description', 'fits')

class productSerializer(serializers.ModelSerializer):
    #components_that_fit = componentSerializer(many=True) 
    class Meta:
        model = Product
        fields = ('name', 'description', 'components')
        #fields = ('name', 'description', 'components_that_fit' )

documented approach似乎对我不起作用，并且给出了以下错误（您可以在上面的serializers.py条目中看到标准方法后面的行注释：

Got AttributeError when attempting to get a value for field 'components_that_fit' on serializer 'productSerializer'. The serializer field might be named incorrectly and not match any attribute or key on the 'Product' instance. Original exception text was: 'Product' object has no attribute 'components_that_fit'.

根据回答更新

感谢@ Carlton在下面的回答，这里有什么对我有用： serializers.py 已更改，现在看起来像这样：

class productSerializer(serializers.ModelSerializer):
    components = componentSerializer(many=True)
    class Meta:
        model = Product
        fields = ('name', 'description', 'components')

Answer 1

通过调用字段components_that_fit，您可以让序列化程序按该名称查找属性。（没有一个，因此你的错误。）

两种解决方法：

调用字段components，但将其声明为components = componentSerializer(many=True)
在声明source='components'字段时设置components_that_fit field option。

获得主键的原因是，除非明确声明，否则relations default to PrimaryKeyRelatedField。

我希望有所帮助。

django rest framework - 嵌套序列化不包括嵌套对象字段

1 个答案: