Django Rest框架ListField和DictField [英] Django Rest Framework ListField and DictField

问题描述

我正在努力理解 ListField 和 DictField 。我想使用它作为串行器上的一个字段。我有一个 ListField ，它可能包含许多 DictField 。我试图编写一个串行器如下：

I am having struggle with understanding ListField and DictField. I want to use it as a field on a serializer. I have a ListField which probably will contain many DictField. I tried to write a serializer as below:

class StopOncomingSerialier(serializers.Serializer):
    idn = serializers.IntegerField(read_only=True)
    buses = serializers.ListField(
        child=serializers.DictField(
            idn=serializers.IntegerField(read_only=True),
            stops_left=serializers.IntegerField(read_only=True)
        ),
    read_only=True
    )

我知道这是没有意义的，因为文档说 DictField 和 ListField take 孩子作为参数。所以，上面的代码自然地提出了错误：

I know, it does not make sense, since the documentation says DictField and ListField take child as argument. And so, the code above naturally raised error:

TypeError： __init __（）得到一个意想不到的关键字参数'

TypeError: __init__() got an unexpected keyword argument 'stops_left'

期望的输出

Desired Output

{
    "idn": 1,
    "buses": [
        {"idn": 11, "stops_left": 4},
        {"idn": 12, "stops_left": 15}
    ]
}

如何实现？ 公交车是一个列表，可能包含与我想要的一样多的元素。

How to achieve this? buses is a list and might contain as many elements as I want.

• python 3.5.1


• django 1.9.6


• django-rest-framework 3.3.3

推荐答案

我想，而不是这样做，你应该使用嵌套的序列化程序。

I think instead of doing that, you should use nested serializers.

创建一个 BusSerializer 有字段 idn 和 stops_left 。然后在 StopOncomingSerializer 中将此串行器包含为总线字段与 many = True 参数来处理多个总线数据。

Create a BusSerializer having fields idn and stops_left. Then include this serializer in your StopOncomingSerializer as buses field with many=True argument to handle multiple buses data.

class BusSerializer(serializers.Serializer):
    idn = serializers.IntegerField(read_only=True)
    stops_left = serializers.IntegerField(read_only=True)


class StopOncomingSerialier(serializers.Serializer):
    idn = serializers.IntegerField(read_only=True)
    buses = BusSerializer(many=True)

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