Django 序列化来自不同模型的字段

Question

我有 3 个这样的模型：

class Category(ClassModelo):
    description = models.CharField(
    max_length=100,
    unique=True
)
class SubCategory(ClassModelo):
    pk_category = models.ForeignKey(Category, on_delete=models.CASCADE)
    description = models.CharField(
    max_length=100,
)
class Product(ClassModelo):
    code = models.CharField(
    description = models.CharField(max_length=200)
    pk_subcategory = models.ForeignKey(SubCategory, on_delete=models.CASCADE
)

我想序列化类别模型中的字段描述，我尝试使用以下代码但它不起作用 (category = serializers.ReadOnlyField(source='pk_subcategory__pk_category_description') :

class ProductsSerializer(serializers.ModelSerializer):
    subcategory = serializers.ReadOnlyField(
        source='pk_subcategory.description')
    category = serializers.ReadOnlyField(source='pk_subcategory__pk_category_description')

    class Meta: 
        model = Product
        fields = ("id", "description", "category", "subcategory")

Answer 1

在 source 参数中使用点符号。因此，应该是

pk_subcategory.pk_category.description 而不是 pk_subcategory__pk_category_description

Django 序列化来自不同模型的字段

Django Serialize a field from a different model

django

serialization