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drf学习-5

时间:2022-10-07 11:45:12浏览次数:55  
标签:info get self request 学习 import class drf

drf视图继承关系表

2个视图基类

之前写5个接口,继承了APIview

还可以继承GenericAPIView,它帮我们干了好多事

GenericAPIView:属性和方法

属性

   掌握项

  -queryset  要序列化的数据

  -serializer_class  序列化类

  了解项

        -lookup_field  # 通过get_object  获取单个对象的查询key值,value值是路由中传进来的
        -filter_backends  # 过滤类
        -pagination_class # 分页类

方法

  掌握项

  -get_queryset  获取要序列化的数据

  -get_object  根据lookup_field配置的参数获取单个对象

  -get_serializer  获取序列化类 咱们直接用的

  -get_serializer_class  获取序列化类 不是咱们直接用的get_serializer调用了它

  了解项

        -paginate_xxx    # 跟分页有关 

  -filter_queryset # 跟过滤有关系

基于APIView写5个接口

urls.py

from django.contrib import admin
from django.urls import path
from app01.views import PublishView, PublishDetailView

urlpatterns = [
    path('admin/', admin.site.urls),
    path('publish/', PublishView.as_view()),
    path('publish/<int:pk>/', PublishDetailView.as_view())
]
models.py
from django.db import models


# Create your models here.

class Publish(models.Model):
    name = models.CharField(max_length=32, verbose_name='出版社名称')
    address = models.CharField(max_length=64, verbose_name='出版社地址')
    contact_way = models.CharField(max_length=32, verbose_name='联系方式')
views.py
from django.shortcuts import render
from rest_framework.views import APIView
# Create your views here.
from .models import Publish
from .serializer import PublishModelSerializer
from rest_framework.response import Response
from rest_framework.status import HTTP_200_OK, HTTP_404_NOT_FOUND


class PublishView(APIView):
    def get(self, request):
        publish_list = Publish.objects.all()
        info = PublishModelSerializer(instance=publish_list, many=True)
        return Response(info.data)

    def post(self, request):
        info = PublishModelSerializer(data=request.data)
        if info.is_valid():
            info.save()
            return Response({'msg': '新增成功'}, status=HTTP_200_OK)
        else:
            return Response({'msg': info.errors}, status=HTTP_404_NOT_FOUND)


class PublishDetailView(APIView):
    def get(self, request, pk):
        publish = Publish.objects.filter(pk=pk).first()
        info = PublishModelSerializer(instance=publish)
        return Response(info.data)

    def Put(self, request, pk):
        book = Publish.objects.filter(pk=pk).first()
        info = PublishModelSerializer(instance=Publish, data=request.data)
        if info.is_valid():
            info.save()
            return Response({'msg': '修改成功'}, status=HTTP_200_OK)
        else:
            return Response({'msg': info.errors}, status=HTTP_404_NOT_FOUND)

    def delete(self, request, pk):
        Publish.objects.filter(pk=pk).delete()
        return Response({'msg': '删除成功'}, status=HTTP_200_OK)
Serializer.py
from rest_framework import serializers
from .models import Publish


class PublishModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = Publish
        fields = '__all__'

 基于GenericAPIView写5个接口

 views.py

from django.shortcuts import render
from rest_framework.views import APIView
# Create your views here.
from .models import Publish
from .serializer import PublishModelSerializer
from rest_framework.response import Response
from rest_framework.status import HTTP_200_OK, HTTP_404_NOT_FOUND
from rest_framework.generics import GenericAPIView


class PublishView(GenericAPIView):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer

    def get(self, request):
        publish_list = self.get_queryset()
        info = self.get_serializer(instance=publish_list, many=True)
        return Response(info.data)

    def post(self, request):
        info = self.get_serializer(data=request.data)
        if info.is_valid():
            info.save()
            return Response({'msg': '新增成功'}, status=HTTP_200_OK)
        else:
            return Response({'msg': info.errors}, status=HTTP_404_NOT_FOUND)


class PublishDetailView(GenericAPIView):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer

    def get(self, request, pk):
        publish = self.get_object()
        info = self.get_serializer(instance=publish)
        return Response(info.data)

    def Put(self, request, pk):
        book = self.get_object()
        info = self.get_serializer(instance=Publish, data=request.data)
        if info.is_valid():
            info.save()
            return Response({'msg': '修改成功'}, status=HTTP_200_OK)
        else:
            return Response({'msg': info.errors}, status=HTTP_404_NOT_FOUND)

    def delete(self, request, pk):
        self.get_queryset().filter(pk=pk).delete()
        return Response({'msg': '删除成功'}, status=HTTP_200_OK)

 5个视图扩展类

CreateModelMixin:Create方法,就是咱们原来的post                       新增数据
RetrieveModelMixin:retrieve方法,就是咱们原来的get	       	       获取单条数据	
UpdateModelMixin:update方法,就是咱们原来的put		     	       修改数据
ListModelMixin:list方法,就是原来咱们的get			       获取所有数据
DestroyModelMixin:destroy方法,就是原来咱们的delete       	       删除数据


### 必须配合GenericAPIView使用,不能配合APIView使用

 基于GenericAPIView+5个视图扩展类编写5个接口

views.py
from .models import Publish
from .serializer import PublishModelSerializer
from rest_framework.generics import GenericAPIView
from rest_framework.mixins import RetrieveModelMixin, CreateModelMixin, UpdateModelMixin, DestroyModelMixin, \
    ListModelMixin


class PublishView(GenericAPIView, ListModelMixin, CreateModelMixin):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer

    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(GenericAPIView, RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer

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

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

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

 基于9个视图子类写接口

视图类:继承了GenericAPIView加上某个或某几个视图扩展类

views.py
from rest_framework.generics import ListAPIView, CreateAPIView, RetrieveAPIView, DestroyAPIView, UpdateAPIView
from rest_framework.generics import ListCreateAPIView, RetrieveUpdateDestroyAPIView, RetrieveDestroyAPIView, \
    RetrieveUpdateAPIView


class PublishView(ListCreateAPIView):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer


class PublishDetailView(RetrieveUpdateDestroyAPIView):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer

 视图集

使用视图集ViewSet,可以将一系列逻辑相关的动作放到一个类中

list() 提供一组数据
retrieve 提供单个数据
create 创建数据
update 保存数据
destory 删除数据

 ViewSet视图集不再实现get(),post()等方法,而是实现动作action 如:list()、create()等

 继承ModelViewSet编写5个接口

 urls.py

from django.contrib import admin
from django.urls import path
from app01.views import PublishView

urlpatterns = [
    path('admin/', admin.site.urls),
    path('publish/', PublishView.as_view({'get': 'list', 'post': 'create'})),
    path('publish/<int:pk>/', PublishView.as_view({'get': 'retrieve', 'put': 'update', 'delete': 'destroy'}))
]

 views.py

from rest_framework.viewsets import ModelViewSet, ReadOnlyModelViewSet


class PublishView(ModelViewSet):
    queryset = Publish.objects.all()
    serializer_class = PublishModelSerializer

 ViewSetMixin源码分析

from rest_framework.viewsets import ViewSetMixin, ViewSet, GenericViewSet

# ViewSet: APIView+ViewSetMixin的组合
# ViewSetMixin: 控制了路由的写法
# GenericViewSet: GenericAPIView+ViewSetMixin的组

"""
ModelViewSet它继承了很多类,其中GenericViewSet继承了GenericAPIView+ViewSetMixin,而ViewSetMixin方法之所以能够控制路由,就是因为它重写了as_view
所以在路由配置中的as_view,其实已经不是APIview中的as_view了,这里的as_view就是ViewSetMixin方法的as_view

继承ViewSetMixin的as_view,是根据继承的查找顺序执行的   userview>>>>ModelViewSet>>>>GenericAPIView>>>>>ViewSetMixin

            mixins.CreateModelMixin,
            mixins.RetrieveModelMixin,
            mixins.UpdateModelMixin,
            mixins.DestroyModelMixin,
            mixins.ListModelMixin,
            GenericViewSet

"""
class ViewSetMixin:
    @classonlymethod
    def as_view(cls, actions=None, **initkwargs):
        # 路由中as_view中必须传参数,必须传字典:{'get': 'list', 'post': 'create'}
        if not actions: 
            raise TypeError("The `actions` argument must be provided when "
                            "calling `.as_view()` on a ViewSet. For example "
                            "`.as_view({'get': 'list'})`")
        # 路由匹配成功,执行view(request),request是老的request
        def view(request, *args, **kwargs):
            # actions={'get': 'list', 'post': 'create'}
            for method, action in actions.items():
                # method:get      action:list
                # self 是视图类的对象中通过反射,查找list,
                # handler视图类中的list方法
                handler = getattr(self, action)
                # 向视图类的对象中,反射 method:get,handler:list方法
                # self.get=list
                setattr(self, method, handler)
            return self.dispatch(request, *args, **kwargs)
        return csrf_exempt(view)


# 只要继承了ViewSetMixin,路由写法就会变,都要写成:views.UserView.as_view({'get': 'list', 'post': 'create'}))
# 这样写好以后,对应的请求方式来了,就会执行配置的方法


# 扩展:
	-以后只要继承了ViewSetMixin,视图类中可以写任意名字的方法,不用非得写get,post,delete

标签:info,get,self,request,学习,import,class,drf
From: https://www.cnblogs.com/zzjjpp/p/16759271.html

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