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【三】DRF之CBV源码和request源码分析

发布时间 2023-07-31 12:14:18作者: Chimengmeng

【一】CBV源码分析

# 视图层
from django.shortcuts import render, HttpResponse
from django.views import View
class CBVTest(View):
    # 通过调度(dispatch)分发请求
    def dispatch(self, request, *args, **kwargs):
        pass
        super().dispatch(request, *args, **kwargs)
        pass

    def get(self, request):
        return render(request, 'cbv.html')

    def post(self, request):
        return HttpResponse('cbv post method')
<!-- 模板层 -->
<form action="/cbv/" method="post">
    {% csrf_token %}
    <input type="text" name="usr">
    <button type="submit">提交</button>
</form>
# 路由层
from app import views
urlpatterns = [
    url(r'^cbv/', views.CBVTest.as_view()),
]

【二】drf基本使用及request源码分析

【1】APIView的使用

（1）安装drf：

pip3 install djangorestframework

（2）settings.py注册app：

INSTALLED_APPS = [..., 'rest_framework']

（3）基于cbv完成满足RSSTful规范的接口

# 视图层
from rest_framework.views import APIView
from rest_framework.response import Response
user_list = [{'id': 1, 'name': 'Bob'}, {'id': 2, 'name': 'Tom'}]
class Users(APIView):
    def get(self, request, *args, **kwargs):
        return Response({
            'status': 0,
            'msg': 'ok',
            'results': user_list
        })
    def post(self, request, *args, **kwargs):
        # request对formdata，urlencoded，json三个格式参数均能解析
        name = request.data.get('name')
        id = len(user_list) + 1
        user = {'id': id, 'name': name}
        user_list.append(user)
        return Response({
            'status': '0',
            'msg': 'ok',
            'results': user
        })

# 路由层
from app import views
urlpatterns = [
    url(r'^users/', views.Users.as_view()),
]

【2】APIView和Request对象源码分析

（1）APIView

  • as_view()
# 核心走了父类as_view
view = super(APIView, cls).as_view(**initkwargs)
# 返回的是局部禁用csrf认证的view视图函数
return csrf_exempt(view)
  • dispatch(self, request, *args, **kwargs)
# 二次封装request对象
request = self.initialize_request(request, *args, **kwargs)
# 自定义request规则
self.initial(request, *args, **kwargs)
  • initialize_request(self, request, *args, **kwargs)
# 原生request封装在request._request
  • initial(self, request, *args, **kwargs)
# 认证
self.perform_authentication(request)
# 权限
self.check_permissions(request)
# 频率
self.check_throttles(request)

（2）Request对象