Question

如何使用Django Rest序列化程序序列化Floats列表列表？

我的数据是（我的对象列表的repr）：

[{
    'id': '413',
    'data': [
        [None, 32.33125, None, None],
        [None, 37.96, 48.70112359550562, 66.118],
        [None, None, 58.06576923076923, 77.31023809523809],
        [None, None, None, 110.0075],
        [None, None, None, 139.89]
    ]
}, {
    'id': '406',
    'data': [
        [None, 35.33125, None, None],
        [None, 37.96, 43.123, 66.118],
        [None, None, 58.12, 72,123],
        [None, None, None, 119.000234],
        [None, None, None, 139.89]
    ]
}]

对于尝试提出不同方法的用户，我需要解释我需要序列化程序类，因为我想使用generics.ListAPIView，我需要设置serializer_class属性。

Answer 1

您必须创建适用于Field值的Null课程：

class FixedFloatField(serializers.FloatField):
    def to_internal_value(self, data):
        if data is None:
            return data
        return super().to_internal_value(data)

    def to_representation(self, value):
        if value is None:
            return value
        return super().to_representation(value)

（因为标准的一个会抛出TypeError: float() argument must be a string or a number, not 'NoneType'）

现在使用此序列化程序（诀窍是使用ListField）：

class SearchResultSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    data = serializers.ListField(
        child=serializers.ListField(
            child=FixedFloatField(
                allow_null=True,
                required=False,
                default=None
            )
        )
    )

Answer 2

您可以使用biult-in json模块。

data = [{
    'id': '413',
    'data': [
        [None, 32.33125, None, None],
        [None, 37.96, 48.70112359550562, 66.118],
        [None, None, 58.06576923076923, 77.31023809523809],
        [None, None, None, 110.0075],
        [None, None, None, 139.89]
    ]
}, {
    'id': '406',
    'data': [
        [None, 35.33125, None, None],
        [None, 37.96, 43.123, 66.118],
        [None, None, 58.12, 72,123],
        [None, None, None, 119.000234],
        [None, None, None, 139.89]
    ]
}]

import json
json_data = json.dumps(data)

您可以将其与DRF视图混合使用：

from rest_framework.response import Response
...
json_data = json.dumps(data)
return Response(json_data)

修改

使用ListAPIView

假设您的数据来自名为 Mymodel的模型

# Serializer from rest_framework import serializers class MymodelSerializer(serializers.ModelSerializer): class Meta: model = Mymodel # View from rest_framework import generics class MymodelList(generics.ListAPIView): queryset = Mymodel.objects.filter(whatever=whatever) def list(self, request): # Note the use of `get_queryset()` instead of `self.queryset` queryset = self.get_queryset() serializer = UserSerializer(queryset, many=True) return Response(serializer.data)

Taken from DRF docs

Django Rest Framework：如何序列化列表列表？

2 个答案: