【DRF_02】基于Django CBV实现

• 路由系统

from django.urls import path
from app01.views import cbv_demo

urlpatterns = [
    # path('admin/', admin.site.urls),
    path('cbv/demo/', cbv_demo.StudentsView.as_view()),
]

• CBV视图

from django.views import View
from django.shortcuts import HttpResponse
from django.views.decorators.csrf import csrf_exempt,csrf_protect
from django.utils.decorators import method_decorator

"""
CBV知识点：
1.流程：路由--》view--》dispatch（反射）
2.取消csrf认证，有两种方式。重写dispatch，装饰dispatch。直接装饰类：@method_decorator(csrf_exempt,name='dispatch')
3.csrf认证，是基于中间件的process_view中实现。
    中间件总共有5个方法，process_request,process_view,process_respones,process_exception,process_render_template
    流程：执行所有的process_request--》》路由匹配--》》执行所有的process_view-->>视图函数--》》执行process——response
    原因：我们在取消csrf认证的时候，加了装饰器-->>某个函数免除csrf认证--->>所以在认证的过程中需要判断函数有没有加装饰器--->>所以需要先做路由匹配，找到函数
"""
class MyBaseView(View):
    # @method_decorator(csrf_exempt)    # 1.免除csrf认证，必须在dispatch中使用在类中使用
    def dispatch(self, request, *args, **kwargs):
        print('before')
        ret = super(MyBaseView,self).dispatch(request, *args, **kwargs)
        print('after')
        return ret

# @method_decorator(csrf_exempt,name='dispatch')   # 2.直接装饰类
class StudentsView(MyBaseView,View):
    def get(self,request,*args,**kwargs):
        return HttpResponse('GET')

    def post(self,request,*args,**kwargs):
        return HttpResponse('POST')

    def delete(self,request,*args,**kwargs):
        return HttpResponse('DELETE')

    def put(self,request,*args,**kwargs):
        return HttpResponse('PUT')


class TeacherView(MyBaseView,View):

    def get(self, request, *args, **kwargs):
        return HttpResponse('GET')

    def post(self, request, *args, **kwargs):
        return HttpResponse('POST')

    def delete(self, request, *args, **kwargs):
        return HttpResponse('DELETE')

    def put(self, request, *args, **kwargs):
        return HttpResponse('PUT')

• 实现效果