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  • Python之Django rest_Framework(3)

    补充:

     为什么要前后端分离:

          a、因为前端它有自己框架,这样它的效率就非常高

          b、不做前后端分离,公司如果既有客户端,又有app这种情况下你就的写两遍

    django restful框架好处:

          帮助我们写了好多组件比如:

          a、认证:有类,类中的方法authenticate/authenticate_header,它的返回值有None,元组,异常。如果返回值为None那就不管,它是匿名用户。

          b、权限:有类,类中的方法:has_permission

          c、节流:有类,类的方法:allow_request,在这里allow_request来表示限制,它是通过IP来限制,

                          它的内部原理是:默认是IP,用户来用IP,这个IP可能代理IP,IP或者是代理IP拿着请求头默认放到大家能够的缓存中                          去,每一个人的IP为p,后面的那个列表存它的方位时间,每一次请求进来获取它的当前时间根据时间的个数来比较,在                        比较的过程中看看把不符合时间的个数来进行比较,能访问就继续,不能访问就不要继续。

          d、版本:是url和hostname,他们两个钟每一个都有两个方法一个是帮你拿版本另一个是帮你反向生成url

          e、解析器:用户发过来的请求体数据进行操作

          f、序列化:两个功能:序列化,校验

    一、分页

    分页的三种情况:

           a、记录当前访问页的数据id

           b、最多显示120页

           c、对页码进行加密

    a、基于limit offset做分页

    class P1(LimitOffsetPagination):
        
                    max_limit = 3
                    default_limit = 2
                    limit_query_param = 'limit'
                    offset_query_param = 'offset'
                            
                
                class IndexView(views.APIView):
                    def get(self,request,*args,**kwargs):
                        user_list = models.UserInfo.objects.all()
                        p1 = P1()
                        page_user_list = p1.paginate_queryset(queryset=user_list, request=request, view=self)
                        ser = IndexSerializer(instance=page_user_list, many=True)
                        return Response(ser.data) # 不含上一页和下一页
                        # return p1.get_paginated_response(ser.data) # 含上一页和下一页
                        
                class IndexView(views.APIView):
                    def get(self,request,*args,**kwargs):
                        ret = BaseResponse()
                        try:
                            user_list = models.UserInfo.objects.all()
                            p1 = P1()
                            page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)
                            ser = IndexSerializer(instance=page_user_list,many=True)
                            ret.data = ser.data
                            ret.next = p1.get_next_link()
                        except Exception as e:
                            ret.code= 1001
                            ret.error = 'xxxx错误'
                        return Response(ret.__dict__)

     b. 基于页码的分页

    class P2(PageNumberPagination):
                    # 每页显示的数据条数
                    max_page_size = 5
                    page_size = 2
                    page_size_query_param = 'size'
    
                    # 页码
                    page_query_param = 'page'

    c. 基于Cursor的分页

    class P3(CursorPagination):
                    cursor_query_param = 'cursor'
                    page_size = 2
                    ordering = 'id'
    from django.conf.urls import url,include
    from django.contrib import admin
    
    urlpatterns = [
        #url(r'^admin/', admin.site.urls),
        url(r'^api/(?P<version>[v1|v2]+)/', include('api.urls')),
    ]
    url.py
    REST_FRAMEWORK = {
        "DEFAULT_VERSIONING_CLASS":"rest_framework.versioning.URLPathVersioning",
        "VERSION_PARAM":'version',
        "ALLOWED_VERSIONS":['v1','v2'],
        'DEFAULT_VERSION':'v1',
        'PAGE_SIZE':2
    }
    setting.py
    from django.shortcuts import render
    from rest_framework import views
    from rest_framework.response import Response
    from rest_framework.pagination import LimitOffsetPagination
    
    from api import models
    from api.serializers.index import IndexSerializer
    
    class BaseResponse(object):
        def __init__(self,code=1000,data=None,error=None):
            self.code = code
            self.data = data
            self.error = error
    
    class P1(LimitOffsetPagination):
    
        max_limit = 3
        default_limit = 2
        limit_query_param = 'limit'
        offset_query_param = 'offset'
    
    
    
    class IndexView(views.APIView):
        def get(self, request, *args, **kwargs):
            ret = BaseResponse()
            try:
                user_list = models.UserInfo.objects.all()
                p1 = P1()
                page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)
                ser = IndexSerializer(instance=page_user_list,many=True)
                ret.data = ser.data
                ret.next = p1.get_next_link()
            except Exception as e:
                ret.code= 1001
                ret.error = 'xxxx错误'
    
            return Response(ret.__dict__)
    views.py
    from django.conf.urls import url,include
    from django.contrib import admin
    from api import views
    urlpatterns = [
    
        url(r'^index/$', views.IndexView.as_view()),
    ]
    url.py 和views一个App 下的url

    二、视图

    1、APIView

    class IndexView(views.APIView):
                        def get(self, request, *args, **kwargs):
                            user_list = models.UserInfo.objects.all()
                            ser = IndexSerializer(instance=user_list,many=True)
                            return Response(ser.data)

    2、GenericAPIview(APIView)

    3、GenericViewSet(ViewSetMixin,generics.GenericAPIView)

    路由修改:
                        urlpatterns = [
                            url(r'^index/$', views.IndexView.as_view({'get':'list','post':'create'})),
                            url(r'^index/(?P<pk>d+)$', views.IndexView.as_view({'get':'retrieve'})),
                        ]
                    
                    视图修改:
                        
                        class IndexView(viewsets.GenericViewSet):
    
                            def list(self,request,*args,**kwargs):
    
                                 pass # 获取列表信息
    
                            def retrieve(self, request, *args, **kwargs):
                                pass  # 获取单条数据
    
                            def create(self,request, *args, **kwargs):
                                pass
                    
                    
                    自定义:
                        
                            增
                                POST
                                /users/
                            删
                                DELETE
                                /users/1/
                            改
                                PUT
                                /users/1/
                                
                                patch
                                /users/1/
                            查
                                GET
                                /users/ 
                                GET
                                /users/1/
                                
                            urlpatterns = [
    
                                url(r'^index/$', views.IndexView.as_view()),
                                url(r'^index/(?P<pk>d+)$', views.IndexView.as_view()),
                            ]
                                
                            class IndexView(views.APIView):
    
                                def get(self,request,*args,**kwargs):
                                    pk = kwargs.get('pk')
                                    if pk:
                                        pass # 获取单条信息
                                    else:
                                        pass # 获取列表信息
    
                                def post(self,request,*args,**kwargs):
                                    pass
    
                                def put(self,request,*args,**kwargs):
                                    pass
    
                                def patch(self,request,*args,**kwargs):
                                    pass
    
                                def delete(self,request,*args,**kwargs):
                                    pass

    4、ModelViewSet

    ModelViewSet(mixins.CreateModelMixin,mixins.RetrieveModelMixin,mixins.UpdateModelMixin,mixins.DestroyModelMixin,mixins.ListModelMixin,GenericViewSet)                
                    
                    class IndexView(ModelViewSet):
    REST_FRAMEWORK = {
        "DEFAULT_VERSIONING_CLASS":"rest_framework.versioning.URLPathVersioning",
        "VERSION_PARAM":'version',
        "ALLOWED_VERSIONS":['v1','v2'],
        'DEFAULT_VERSION':'v1',
        # 'PAGE_SIZE':2
    }
    setting.py
    from django.conf.urls import url,include
    from django.contrib import admin
    
    urlpatterns = [
        #url(r'^admin/', admin.site.urls),
        url(r'^api/(?P<version>[v1|v2]+)/', include('api.urls')),
    ]
    url.py
    from django.shortcuts import render
    from rest_framework import views
    from rest_framework import generics
    from rest_framework import viewsets
    from rest_framework.response import Response
    from rest_framework.pagination import LimitOffsetPagination,PageNumberPagination,CursorPagination
    
    from api import models
    from api.serializers.index import IndexSerializer
    
    class P2(PageNumberPagination):
            # 每页显示的数据条数
            max_page_size = 5
            page_size = 2
            page_size_query_param = 'size'
    
            # 页码
            page_query_param = 'page'
    
    class IndexView(viewsets.ModelViewSet):
        queryset = models.UserInfo.objects.all()
        serializer_class = IndexSerializer
        pagination_class = P2
    views
    from django.conf.urls import url,include
    from django.contrib import admin
    from api import views
    urlpatterns = [
    
        url(r'^index/$', views.IndexView.as_view({'get':'list','post':'create'})),
        url(r'^index/(?P<pk>d+)/$', views.IndexView.as_view({'get':'retrieve','delete':'destroy','put':'update','patch':'partial_update'})),
    ]
    url.py 和views一个APP下的路由

    3. 路由

    第一类:

    # http://127.0.0.1:8000/api/v1/auth/
    url(r'^auth/$', views.AuthView.as_view()),
    # http://127.0.0.1:8000/api/v1/auth.json # 想要让页面显示json格式
    url(r'^auth.(?P<format>[a-z0-9]+)$', views.AuthView.as_view()),
    # http://127.0.0.1:8000/api/v1/auth/1/
    url(r'^auth/(?P<pk>d+)/$', views.AuthView.as_view()),
    # http://127.0.0.1:8000/api/v1/auth/1.json
    url(r'^auth/(?P<pk>d+).(?P<format>[a-z0-9]+)$', views.AuthView.as_view()),
    class AuthView(views.APIView):
    
    def get(self,request,*args,**kwargs):
    return Response('...')

    第二类:

    url(r'^index/$', views.IndexView.as_view({'get':'list','post':'create'})),
    url(r'^index/.(?P<format>[a-z0-9]+)$', views.IndexView.as_view({'get':'list','post':'create'})),
    url(r'^index/(?P<pk>d+)/$', views.IndexView.as_view({'get':'retrieve','delete':'destroy','put':'update','patch':'partial_update'})),
    url(r'^index/(?P<pk>d+).(?P<format>[a-z0-9]+)$', views.IndexView.as_view({'get':'retrieve','delete':'destroy','put':'update','patch':'partial_update'})),
    
    class IndexView(viewsets.ModelViewSet):
    queryset = models.UserInfo.objects.all()
    serializer_class = IndexSerializer
    pagination_class = P2

    第三类:

    router = DefaultRouter()
    router.register('index',views.IndexViewSet)
    urlpatterns = [
    url(r'^', include(router.urls)),
    ]
    
    
    class IndexViewSet(viewsets.ModelViewSet):
    queryset = models.UserInfo.objects.all()
    serializer_class = IndexSerializer
    pagination_class = P2
    
    
    
    class IndexSerializer(serializers.ModelSerializer):
    class Meta:
    model = models.UserInfo
    fields = "__all__"


    4. 渲染器
    看到的页面时什么样子的,返回数据。
    renderer_classes = [JSONRenderer,BrowsableAPIRenderer]

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  • 原文地址:https://www.cnblogs.com/mengqingjian/p/8431724.html
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