Question

我使用djangorestframework生成API，我的Serializer为：


from rest_framework import serializers


class MarketSerializer(serializers.Serializer):
    total_market_cap = serializers.FloatField(read_only=True)
    volume = serializers.FloatField(required=False)
    turnover_rate = serializers.FloatField(required=False)
    pe = serializers.FloatField(required=False)


class MarketOverallSerializer(serializers.Serializer):
    # markets = MarketSerializer(many=True)  # A nested list of 'edit' items.
    sh = MarketSerializer()
    sz = MarketSerializer()
    cyb = MarketSerializer()
    zxb = MarketSerializer()

我的APIView为：


import json
from django.shortcuts import render

# Create your views here.
from rest_framework.renderers import JSONRenderer

from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from serializers import MarketSerializer, MarketOverallSerializer
from market.models import Market
from market.parse import *


class MarketView(APIView):

    def get(self, request, *args, **kw):
        # Process any get params that you may need
        # If you don't need to process get params,
        # you can skip this part
        market = market_overall()
        serializer = MarketOverallSerializer(market)
        content = JSONRenderer().render(serializer.data)
        print '**********content:{}'.format(content)
        response = Response(content, status=status.HTTP_200_OK)

        return response

我得到JSON响应：


"{\"sh\":{\"total_market_cap\":262143.47,\"volume\":25240015.73,\"turnover_rate\":0.84,\"pe\":15.8},\"sz\":{\"total_market_cap\":0.0,\"volume\":0.0,\"turnover_rate\":0.0,\"pe\":0.0},\"cyb\":null,\"zxb\":null}"

为什么生成的响应不是有效的JSON输出，有这么多“\”字符？

Answer 1

原因是DRF中的默认渲染器是json（ref：http://www.django-rest-framework.org/api-guide/renderers/#setting-the-renderers）。

因此，每次使用DRF＆＃39; Response时，您应该直接传递dict而不是渲染json。

在你的情况下，通过一次又一次渲染json（使用Response），json内置模块会转义特殊字符并将其视为单个字符串（这就是json.loads()给出的原因回到适当的json）

所以修复它的方法是：

请勿使用JSONRenderer，只需将字典直接传递给Response
删除JSONRenderer，然后专门告诉Response使用text/html作为内容类型。

为什么django rest框架返回无效的JSON响应？

1 个答案: