Django REST - 如何获得具有两个模型的 JSON？

Question

我有两个模型（地图和地点），我想用这两个模型创建一个 JSON（地图包含多个地点）。

models.py

class Map(models.Model):
   name = models.CharField(max_length=100)
   slug = models.SlugField(max_length=200)

class Place(models.Model):
   map = models.ForeignKey('main.Map')
   name = models.CharField(max_length=100)
   slug = models.SlugField(max_length=200)

我用它来单独序列化这些模型：

serializers.py

class MapSerializer(serializers.ModelSerializer):
    class Meta:
        model = Map
        fields = ('id', 'name')

class PlaceSerializer(serializers.ModelSerializer):
    class Meta:
        model = Place
        fields = ('id', 'name', 'map')

我想要这样的 JSON，但我不知道如何正确序列化它...

{
    "maplist": {
        "maps": [
            {
                "id": "1",
                "name": "dust2",
                "places": [
                    {
                        "id": "1",
                        "name": "Long"
                    },
                    {
                        "id": "2",
                        "name": "Middle"
                    }
                ]
            },
            {
                "id": "2",
                "name": "inferno",
                "places": [
                    {
                        "id": "1",
                        "name": "Middle"
                    },
                    {
                        "id": "2",
                        "name": "ASite"
                    }
                ]
            }


        ]
    }
}

提前感谢您的帮助。

Answer 1

尝试使用嵌套序列化器：

class PlaceSerializer(serializers.ModelSerializer):
    class Meta:
        model = Place
        fields = ('id', 'name')

class MapSerializer(serializers.ModelSerializer):
    places = PlaceSerializer(many=True)
    class Meta:
        model = Map
        fields = ('id', 'name')

要完成这项工作，您需要更改模型以包含与外键相关的名称：

class Place(models.Model):
   map = models.ForeignKey('main.Map', related_name="places")
   name = models.CharField(max_length=100)
   slug = models.SlugField(max_length=200)