DRF序列化器（many = True）与ListField（serializer（））有什么区别 [英] DRF what's the difference between serializers(many=True) vs ListField(serializer())

问题描述

何时应使用以下各项？

* MySerializer(many=True)
* serializers.ListField(child=MySerializer())

推荐答案

MySerializer（many = True）-您可以在 MySerializer 对每个对象进行一些序列化时使用。

serializers.ListField（child = MySerializer（））-如果您不仅要序列化对象，而且还要序列化可迭代数据，则可以使用此代码。

MySerializer(many=True) - you can use when MySerializer makes some serialization of each of your objects.
serializers.ListField(child=MySerializer()) - this one you can use if you want to serialize not only objects, but result iterable data too.

例如，您要为每个对象附加其在结果列表中的位置：

For example, you want to append for each object its position in result list:

class ListSerializerWithIds(serializers.ListSerializer):
    @property
    def data(self):
        data = super().data

        result = []
        for i, d in enumerate(data):
            d["list_id"] = i
            result.append(d)
        return result

class MySerializer(serializers.Serializer):
    a = serializer.CharField()

    @classmethod
    def many_init(cls, *args, **kwargs):
        kwargs["child"] = cls()
        return ListSerializerWithIds(*args, **kwargs)

现在，如果您获得 MySerializer 的结果数据，则看起来像是：

now, if you will get result data of MySerializer it will be looks like:

objects = [{"a": "a1", "b": "b1"}, {"a": "a2", "c": "c2"}]
serializer = MySerializer(objects, many=True)
serializer.data
# [{"a": "a1", "list_id": 0}, {"a": "a2", "list_id": 1}]

也可以使用 serializers.ListField（child = MySerializer（））作为另一个序列化器的字段：

Also, you can use serializers.ListField(child=MySerializer()) as a field of another serializer:

class MySerializer(serializers.Serializer):
    a = serializers.CharField()

class AnotherSerializer(serializers.Serializer):
    my_data = serializers.ListField(child=MySerializer())

现在查看结果：

objects = [{"my_data": [{"a": "a1", "b": "b1"}], "tralala": "blablabla"}, ]
serializer = AnotherSerializer(objects, many=True)
serializer.data
# [{"my_data": [{"a": "a1"}]}, ]

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