django rest类型错误字段不是JSON可序列化的

Question

我正在尝试用django实现简单的rest api。但是我收到以下错误，

// model.py

from django.db import models

# Create your models here.


class Event(models.Model):

    name = models.TextField()
    type = models.TextField()
    location = models.TextField()
    start_hour = models.TextField()
    end_hour = models.TextField()
    creator = models.TextField()

    class Meta:
        verbose_name = "Event"
        verbose_name_plural = "Events"

    def __str__(self):
        return self.name

// serializer.py

from rest_framework import serializers
from .models import Event

class EventSerializer(serializers.ModelSerializer):

    class Meta:
        model = Event
        fields = ('name', 'type')

// urls.py

from django.conf.urls import url
from django.contrib import admin
from rest_framework.urlpatterns import format_suffix_patterns
from events import views


urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^events/', views.EventList.as_view()),
]

urlpatterns = format_suffix_patterns(urlpatterns)

我对django太新了，我无法弄清楚如何处理这个错误。请帮帮我们。

Answer 1

这个设置没有任何问题，从教程中删除。

项目文件夹events。

应用程序文件夹django_example/settings.py。

INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'rest_framework', 'events.apps.EventsConfig' ]

添加：

events/apps.py

添加：

from __future__ import unicode_literals from django.apps import AppConfig class EventsConfig(AppConfig): name = 'events'

events/models.py

对于上下文，from __future__ import unicode_literals from django.db import models # Create your models here. class Event(models.Model): name = models.TextField() kind = models.TextField() location = models.TextField() start_hour = models.TextField() end_hour = models.TextField() creator = models.TextField() class Meta: verbose_name = "Event" verbose_name_plural = "Events" def __str__(self): return self.name 看起来像这样：

type

请勿使用events/serializers.py作为字段名称。

添加：

from rest_framework import serializers from .models import Event class EventSerializer(serializers.ModelSerializer): class Meta: model = Event fields = ('name', 'kind')

events/views.py

from django.shortcuts import render # Create your views here. from django.http import HttpResponse from django.views.decorators.csrf import csrf_exempt from rest_framework.renderers import JSONRenderer from rest_framework.parsers import JSONParser from events.models import Event from events.serializers import EventSerializer class JSONResponse(HttpResponse): """ An HttpResponse that renders its content into JSON. """ def __init__(self, data, **kwargs): content = JSONRenderer().render(data) kwargs['content_type'] = 'application/json' super(JSONResponse, self).__init__(content, **kwargs) @csrf_exempt def event_list(request): """ List all code snippets, or create a new snippet. """ if request.method == 'GET': snippets = Event.objects.all() serializer = EventSerializer(snippets, many=True) return JSONResponse(serializer.data) elif request.method == 'POST': data = JSONParser().parse(request) serializer = EventSerializer(data=data) if serializer.is_valid(): serializer.save() return JSONResponse(serializer.data, status=201) return JSONResponse(serializer.errors, status=400) @csrf_exempt def event_detail(request, pk): """ Retrieve, update or delete a code snippet. """ try: event = Event.objects.get(pk=pk) except event.DoesNotExist: return HttpResponse(status=404) if request.method == 'GET': serializer = EventSerializer(snippet) return JSONResponse(serializer.data) elif request.method == 'PUT': data = JSONParser().parse(request) serializer = EventSerializer(event, data=data) if serializer.is_valid(): serializer.save() return JSONResponse(serializer.data) return JSONResponse(serializer.errors, status=400) elif request.method == 'DELETE': event.delete() return HttpResponse(status=204)

添加：

events/urls.py

from django.conf.urls import url from events import views urlpatterns = [ url(r'^events/$', views.event_list), url(r'^events/(?P<pk>[0-9]+)/$', views.event_detail), ]

添加：

django_example/urls.py

添加：

from django.conf.urls import url, include from django.contrib import admin urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^', include('events.urls')) ]

int value = _dict.Values.ElementAt(5);//ElementAt value should be <= _dict.Count - 1
string key = _dict.Keys.ElementAt(5);//ElementAt value should be  < =_dict.Count - 1

如果您在填充models.py后运行迁移，则应该能够看到API的响应，即使它只是一个空列表。