Django RESTFramework——更新数据（5）-白红宇

完整实例

项目结构    Floral        Floral        accounts        manage.pyFloral/urls.pyfrom django.conf.urls import url, includefrom rest_framework import routersfrom accounts import viewsrouter = routers.DefaultRouter()router.register(r'users', views.UserViewSet)router.register(r'groups', views.GroupViewSet)router.register(r'ips', views.IpViewSet)router.register(r'comments', views.CommentViewSet)Floral/accounts/models.pyfrom django.db import models# Create your models here.from django.contrib.auth.models import AbstractBaseUserfrom rest_framework import serializersfrom django.utils.translation import ugettext_lazy as _class MyUsers(models.Model):    #REQUIRED_FIELDS = ('name',)    #USERNAME_FIELD = ('name')    groups = models.ForeignKey(        'Groups',        null=False,        blank=False,        related_name='myusers',        on_delete=models.CASCADE    )    name = models.CharField(        null=False,        blank=False,        max_length=125,    )    email = models.EmailField(        null=False,        blank=False,        max_length=125,    )    url = models.URLField(        null=False,        blank=True,        max_length=125,    )class Groups(models.Model):    name = models.CharField(        null=False,        blank=False,        max_length=125,    )    url = models.URLField(        null=False,        blank=True,        max_length=125,    )class Ip(models.Model):    user = models.ForeignKey(        'MyUsers',        null=False,        blank=False,        related_name='ips',        on_delete=models.CASCADE    )    group = models.ForeignKey(        'Groups',        null=False,        blank=True,        related_name='ips',        on_delete=models.CASCADE    )    ip_addr = models.GenericIPAddressField(        blank=False,        null=False,    )class Comment(models.Model):    email = models.EmailField(        null=False,        blank=False,        max_length=125,    )    content = models.CharField(        null=False,        blank=False,        max_length=200,    )    created = models.DateTimeField(        help_text=_('date'),        auto_now_add=True    )    user = models.ForeignKey(        'MyUsers',        null=False,        blank=False,        related_name='comments',        on_delete=models.CASCADE    )Floral/accounts/views.pyfrom django.shortcuts import render# Create your views here.from django.contrib.auth.models import User, Groupfrom rest_framework import viewsetsfrom accounts.serializers import UserSerializer, GroupSerializer, IpSerializer, CommentSerializerfrom rest_framework.authtoken.models import Tokenfrom rest_framework.response import Responsefrom knox.auth import TokenAuthenticationfrom knox.models import AuthTokenfrom rest_framework.permissions import IsAuthenticated, AllowAnyfrom accounts.models import Ip, Commentclass GroupViewSet(viewsets.ModelViewSet):    """    允许组查看或编辑的API路径。    """    queryset = Group.objects.all()    serializer_class = GroupSerializerclass IpViewSet(viewsets.ModelViewSet):    """    允许组查看或编辑的API路径。    """    queryset = Ip.objects.all()    serializer_class = IpSerializerclass CommentViewSet(viewsets.ModelViewSet):    queryset = Comment.objects.all()    serializer_class = CommentSerializerFloral/accounts/serializers.pyfrom django.contrib.auth.models import User, Groupfrom rest_framework import serializersfrom accounts.models import Ipfrom rest_framework.response import Responsefrom datetime import datetimefrom rest_framework.renderers import  JSONRendererfrom rest_framework.parsers import JSONParserfrom django.utils.six import BytesIOclass UserSerializer(serializers.HyperlinkedModelSerializer):    class Meta:        model = User        fields = ('url', 'username', 'email', 'groups', 'user')class GroupSerializer(serializers.HyperlinkedModelSerializer):    class Meta:        model = Group        fields = ('url', 'name')class IpSerializer(serializers.HyperlinkedModelSerializer):    #SerializerMethodField（）： Serialization and deserialization    group = serializers.SerializerMethodField()    user = serializers.SerializerMethodField()    class Meta:        model = Ip        fields = ('user',  'ip_addr', 'group')    def get_group(self, obj):        group = obj.group        return{
   'url': group.url,               'name': group.name,              }    def get_user(self, obj):        user = obj.user        if user:            print(1)        return {            'name': user.name + ' ' + 'hello'        }    def get_attribute(self, instance):        a = instance        print(a)        return instanceclass Comment(object):    def __init__(self, email, content, created=None):        self.email = email        self.content = content        self.created = created or datetime.now()class CommentSerializer(serializers.Serializer):    email = serializers.EmailField()    content = serializers.CharField(max_length=200)    created = serializers.DateTimeField()        def create(self, validated_data):        return Comment(**validated_data)    def update(self, instance, validated_data):        instance.email = validated_data.get('email', instance.email)        instance.content = validated_data.get('content', instance.content)        instance.created = validated_data.get('created', instance.created)        return instancecomment = Comment('1111@qq.com', content='foo bar')serializer = CommentSerializer(comment)s = serializer.datajson = JSONRenderer().render(s)stream = BytesIO(json)data = JSONParser().parse(stream)print(data)serializer = CommentSerializer(data=data)serializer.is_valid()k = serializer.validated_dataprint(k)复制代码

访问http://127.0.0.1:8000/comments/1/

PATCH http://127.0.0.1:8000/comments/1/ 更新部分数据（可以是单条数据）对应于drf中的update方法

具体的HTTP方法和drff中的操作对应关系参考https://www.jianshu.com/p/69bdfc531f48

使用postman测结果

https://note.youdao.com/yws/res/32204/WEBRESOURCE57124744967a96fa0af039a2aff731a3

如果Comment是一个模型Model

def create(self, validated_data):        return Comment(**validated_data)    def update(self, instance, validated_data):        instance.email = validated_data.get('email', instance.email)        instance.content = validated_data.get('content', instance.content)        instance.created = validated_data.get('created', instance.created)        return instance可以更改为    def create(self, validated_data):        return Comment.objects.create(**validated_data)    def update(self, instance, validated_data):        instance.email = validated_data.get('email', instance.email)        instance.content = validated_data.get('content', instance.content)        instance.created = validated_data.get('created', instance.created)        instance.save()        return instance如果你的对象实例对应Django的模型，你还需要确保这些方法将对象保存到数据库。例如，如果Comment是一个Django模型的话。【Django rest framework 官方文档解释】复制代码