restful规范 之 CBV 实现接口流程梳理

一、CBV实现demo代码展示

1、urls.py

urlpatterns = [
    path('admin/', admin.site.urls),
    re_path(r'^Students/$',views.StudentView.as_view()),
]

2、views.py

from django.shortcuts import render,HttpResponse

from django.views import View

class StudentView(View):

    def get(self,request):
        print("查看所有的学生。。。")
        return HttpResponse("查看所有的学生。。。")

    def post(self,request):
        print("添加一个学生。。。")
        return HttpResponse("添加一个学生。。。")

3、通过postman请求接口 http://127.0.0.1:8000/Students/

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二、CBV执行过程理解 

 

 备注：

 在 StudentView(View)类的父类View下的dispatch方法理解：

def dispatch(self, request, *args, **kwargs):
    # Try to dispatch to the right method; if a method doesn't exist,
    # defer to the error handler. Also defer to the error handler if the
    # request method isn't on the approved list.
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)  # getattr(object,name,default) object: 对象；name:字符串，对象属性；default：默认返回值，如果不提供该参数，在没有对应属性时，将触发 AttributeError。
    else:
        handler = self.http_method_not_allowed
    return handler(request, *args, **kwargs)　

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