django-rest 框架序列化器关系作为字典而不是数组

Question

我正在尝试将外键序列化为字典而不是数组。 现在 json 看起来如下：

{
"slug": "en",
"children": [{
        "slug": "pants",
        "children": [{
                "slug": "products/:level1",
                "children": [{
                    "slug": ":level2/:level3",
                    "children": []
                }]
            },
            {
                "slug": ":productSlug",
                "children": []
            }
        ]
    },
    {
        "slug": "pullovers",
        "children": []
    }
   ]
}

但我希望它使用蛞蝓作为钥匙：

{
"en": {
    "children": {
        "pants": {
            "children": {
                "products/:level1": {
                    "children": {
                        ":level2/:level3": {
                            "children": {}
                        }
                    }
                }
            },
            ":productSlug": {
                "children": {}
            }
        ]
    }
 }
}

是否可以直接在序列化程序中执行此操作，还是必须在附加步骤中进行转换？

Answer 1

正如我在answer 中所建议的那样，可以通过覆盖list serializers 并为每个需要它的序列化程序设置list_serializer_class 来实现。

当然，你需要稍微调整一下：

class <YourClass>ListSerializer(serializers.ListSerializer):
    def to_representation(self, data):
        r = super().to_representation(data)

        return { item['<key_field>']: item for item in r }

Answer 2

@Michael Rigonis 的回答 (https://stackoverflow.com/a/45238191/270265) 是成功的关键。我不得不稍微调整一下，所以我也可以将它用于顶级。：

class DictSerializer(serializers.ListSerializer):
    key = None

    def __init__(self, *args, **kwargs):
        self.key = kwargs.pop('key', self.key)
        super().__init__(*args, **kwargs)

    def to_representation(self, data):    
        r = super().to_representation(data)
        return {item[self.key]: item for item in r}

    @property
    def data(self):
        # This is a bit nasty, because the only "Many-Serializer" is a ListSerializer we inherit of it,
        # but when converting it to json we call the BaseSerializer directly, because we want a Dictionary rather then a list
        ret = super(serializers.ListSerializer, self).data
        return ReturnDict(ret, serializer=self)