标签：06 self args request kwargs return def drf

路由层

自动生成路由

1.路由类导入

from rest_framework.routers import SimpleRouter, DefaultRouter

2.实例化

router = SimpleRouter()

3.注册

router.register('login', BookView, 'login')

4.将自动生成的路由添加到urlpatterns中(两种方式结果一样)

方式一：urlpatterns += router.urls
方式二：path('login/', include(router.urls))

5.自动生成的路由

5.1 使用路由类SimpleRouter 
    router = SimpleRouter()
5.2 使用路由类DefaultRouter
    router = DefaultRouter()

注：继承ViewSetMixin的类及其子类的类可以使用自动生成路由

视图层

action装饰器的使用

1.装饰器导入：from rest_framework.decorators import action
2.action装饰器的参数
2.1 methods：请求类型可多个
2.2 detail：控制生成的网址
默认False：注册路由 router.register('user', BookView, 'user')
user/login
True: user/pk/login
2.3 url_path：控制生成的路由user/后面的路径默认是方法名
2.4 url_name：起别名用于反向解析

class UserView(ModelViewSet):
    queryset = Book.objects.all()
    serializer_class = BookSerializer
    @action(methods=['GET', ], detail=False)
    def login(self, request):
        return Response('登录成功')

编写登录接口

路由层

1.导入路由类：SimpleRouter
2.实例化：router = SimpleRouter()
3.注册
4.将自动生成的路由添加至urlpatterns 
from django.urls import path, include(路由分发)
from rest_framework.routers import SimpleRouter
from app01.views import UserView

router = SimpleRouter()
router.register('user', UserView, 'user')
urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include(router.urls))
]

视图层

1.继承ViewSet==ViewSetMixin, views.APIView 类中的方法可以写任意方法名
2.
from rest_framework.viewsets import ViewSet
from rest_framework.decorators import action
from rest_framework.response import Response
from app01.models import User, UserToken
from uuid import uuid4

class UserView(ViewSet):
    @action(methods=['POST', ], detail=False)
    def login(self, request):
        name = request.data.get('name')
        password = request.data.get('password')
        user = User.objects.filter(name=name, password=password).first()   
        if user:
            token = str(uuid4())
            UserToken.objects.update_or_create(defaults={'token': token}, user=user)
            return Response({'code': 100, 'mag': '登录成功'})
        else:
            return Response({'code': 101, 'msg': '用户名或密码错误'})

认证

1.写认证类继承BaseAuthentication
2.重写父类BaseAuthentication中的authenticate方法
3.获取网址中携带的随机字符串 # 类似于cookie与session操作
4.获取数据库数据判断是否一致存在可以访问返回 user_token.user(后续可以使用), token
5.否则直接抛异常AuthenticationFailed
6.全局配置认证类：在配置文件中配置

REST_FRAMEWORK={'DEFAULT_AUTHENTICATION_CLASSES':['app01.auth.LoginAuth',]}
  局部配置：类中authentication_classes = [auth.LoginAuth,]
  局部禁用：类中authentication_classes = []
from rest_framework.authentication import BaseAuthentication
from app01.models import UserToken
from rest_framework.exceptions import AuthenticationFailed

class LoginAuth(BaseAuthentication):
    def authenticate(self, request):
        token = request.GET.get('token')  # 获取网址中携带的随机字符串
        user_token = UserToken.objects.filter(token=token).first()
        if not user_token:
            raise AuthenticationFailed('你没有登录')
        return user_token.user, token

作业

1.1 登录接口，图书5个接口，出版社5个接口（关联的关系），，使用9个视图子类，5个视图扩展类写

5个视图扩展类写图书与出版社5个接口
路由层：
urlpatterns = [
    path('books/', BookView.as_view()),
    path('books/<int:pk>', BookDetailView.as_view()),
    path('publish/', PublishView.as_view()),
    path('publish/<int:pk>', PublishDetailView.as_view())
]
序列化类：
from rest_framework import serializers
from app01.models import Book, Publish

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = '__all__'

    publish = serializers.SerializerMethodField()

    def get_publish(self, obj):
        return {'name': obj.publish.name, 'address': obj.publish.address}

class PublishSerializer(serializers.ModelSerializer):
    class Meta:
        model = Publish
        fields = '__all__'
 视图层：
图书查所有、增加
class BookView(ListModelMixin, CreateModelMixin, GenericAPIView):
    queryset = models.Book.objects.all()
    serializer_class = BookSerializer

    def get(self, request,  *args, **kwargs):
        return self.list(request,  *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)
图书查单条、修改单条、删除单条
class BookDetailView(RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin, GenericAPIView):

    queryset = models.Book.objects.all()
    serializer_class = BookSerializer

    def get(self, request, pk):
        return self.retrieve(request)

    def put(self, request, pk):
        return self.update(request)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)
出版社查所有、增加
class PublishView(ListModelMixin, CreateModelMixin, GenericAPIView):

    queryset = models.Publish.objects.all()
    serializer_class = PublishSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

出版社查单条、修改单条、删除单条
class PublishDetailView(RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin, GenericAPIView):

    queryset = models.Publish.objects.all()
    serializer_class = PublishSerializer

    def get(self, request, pk):
        return self.retrieve(request)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

2 图书的必须登录后才能方法，出版社的不登录就能访问

1.认证类
from rest_framework.authentication import BaseAuthentication
from app01.models import UserToken
from rest_framework.exceptions import AuthenticationFailed

class LoginAuth(BaseAuthentication):
    def authenticate(self, request):
        token = request.GET.get('token')  # 获取网址中携带的随机字符串
        user_token = UserToken.objects.filter(token=token).first()
        if not user_token:
            raise AuthenticationFailed('你没有登录')
        return user_token.user, token
 2.全局配置：所有视图类都需登录才可以访问
  在配置文件中配置：
    REST_FRAMEWORK = {'DEFAULT_AUTHENTICATION_CLASSES': ['app01.auth.LoginAuth', ]}
 3.图书的必须登录后才能方法
class BookView(ListModelMixin, CreateModelMixin, GenericAPIView):
    queryset = models.Book.objects.all()
    serializer_class = BookSerializer

    def get(self, request,  *args, **kwargs):
        return self.list(request,  *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)


class BookDetailView(RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin, GenericAPIView):

    queryset = models.Book.objects.all()
    serializer_class = BookSerializer

    def get(self, request, pk):
        return self.retrieve(request)

    def put(self, request, pk):
        return self.update(request)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)
   4.出版社的不登录就能访问；局部禁用 authentication_classes = []
class PublishView(ListModelMixin, CreateModelMixin, GenericAPIView):
    authentication_classes = []
    queryset = models.Publish.objects.all()
    serializer_class = PublishSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)


class PublishDetailView(RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin, GenericAPIView):

    authentication_classes = []

    queryset = models.Publish.objects.all()
    serializer_class = PublishSerializer

    def get(self, request, pk):
        return self.retrieve(request)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

3.级联删除中的参数(on_delete中的参数中的值)

1.on_delete=models.None：删除关联表中的数据时，当前表与其关联的field的行为
2.on_delete=models.CASCADE：级联删除，删除关联关系，与之关联也删除
3.on-delete=models.DO_NOTHING：删除管来呢数据，什么也不做
4.on_delete=models.PRPTECT：保护模式，删除关联数据，引发错误protectedError
5.on_delete=models.SET_NULL：置空模式，删除的时候，外键字段被设置为空，前提就是blank=True, null=True,定义该字段的时候，允许为空。当Manufacturer对象删除时，它对应的Car对象的manufacturer字段会置空，前提是null=True
6.on_delete=models.SET_DEFAULT：删除关联数据,与之关联的值设置为默认值（前提FK字段需要设置默认值,一对一同理）置默认值，删除的时候，外键字段设置为默认值，所以定义外键的时候注意加上一个默认值。
7.on_delete=models.SET：删除关联数据,自定义一个值，该值当然只能是对应的实体了
  7.1 与之关联的值设置为指定值,设置：models.SET(值)
  7.2 与之关联的值设置为可执行对象的返回值,设置：models.SET(可执行对象)

标签：06,self,args,request,kwargs,return,def,drf
From： https://www.cnblogs.com/040714zq/p/16770002.html

drf-06

路由层

自动生成路由

视图层

action装饰器的使用

编写登录接口

路由层

视图层

认证

作业

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