Question

我有两个模型，如：

class Car(models.Model):
    name = models.CharField(max_length=255)

class CarImage(models.Model):
    car = models.ForeignKey(Car, related_name='photos')
    photo = models.ImageField(upload_to='car/')

从上面的模型我想要获取汽车的所有图像。所以我按照以下方式编写了我的serailzer：

class CarSerializer(serializers.ModelSerializer):
    """
    """
    _id = serializers.ReadOnlyField(source='pk')

    photos = serializers.RelatedField(many=True, read_only=True)

    class Meta:
        model = Car
        fields = ('my_field_here', )

class CarImageSerializer(serializers.ModelSerializer):
    """

    """
    _id = serializers.ReadOnlyField(source='pk')

    class Meta:
        model = CarImage
        fields = ('my_field_here', )

但在CarSerializer序列化工具照片字段中显示此错误RelatedField.to_representation() must be implemented for field . If you do not need to support write operations you probably want to subclass ReadOnlyField instead. 但我使用PrimaryKeyRelatedField而不是RelatedField，然后它工作正常，我得到主键列表，但我想要所有字段。

我还尝试将CarImageSerializer用作

在Carserializer decalared

中

assets_keys = serializers.SerializerMethodField()
def get_assets_keys(self, obj):
    return AssetKeySerializer(obj.asset_keys.all(), context=self.context).data

但是它不能序列化资产键列表，它需要单个对象。

所以我的问题是可以使用序列化程序获取相关的对象数据。如果是，我需要在序列化器中纠正什么？

我的回答必须如下：

[
  {
    "_id": 1,
    "name": "first",
    "photos": [
      "name":"xyz",
      "photo":"path_to_photo"
    ]
  },
   {
    "_id": 1,
    "name": "second",
    "photos": [
      "name":"abcddd",
      "photo":"path_to_photo"
    ]
  },
]

Answer 1

您需要在CarSerializer中使用nested serializer：

photos = CarImageSerializer(many=True, read_only=True)

提取Serilazier

1 个答案: