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  • django rest framework 一个请求的大致处理流程

        def dispatch(self, request, *args, **kwargs):
            """
            `.dispatch()` is pretty much the same as Django's regular dispatch,
            but with extra hooks for startup, finalize, and exception handling.
            """
            self.args = args
            self.kwargs = kwargs
            request = self.initialize_request(request, *args, **kwargs)  # 创建 Request 对象
            self.request = request
            self.headers = self.default_response_headers  # deprecate?
    
            try:
                self.initial(request, *args, **kwargs)  #  依次进行,认证,权限检查,限流检查
    
                # Get the appropriate handler method
                if request.method.lower() in self.http_method_names:
                    handler = getattr(self, request.method.lower(),
                                      self.http_method_not_allowed)
                else:
                    handler = self.http_method_not_allowed
    
                response = handler(request, *args, **kwargs)  # 进入 GET, POST, PATCH, PATCH 等 View 下面的各个方法的处理逻辑 
    
            except Exception as exc:
                response = self.handle_exception(exc)
    
            self.response = self.finalize_response(request, response, *args, **kwargs)  # 对 response 对象进行进一步处理
            return self.response  # 返回给客户端
    
         
        def initial(self, request, *args, **kwargs):
            """
            Runs anything that needs to occur prior to calling the method handler.
            """
            self.format_kwarg = self.get_format_suffix(**kwargs)
    
            # Perform content negotiation and store the accepted info on the request
            neg = self.perform_content_negotiation(request)
            request.accepted_renderer, request.accepted_media_type = neg
    
            # Determine the API version, if versioning is in use.
            version, scheme = self.determine_version(request, *args, **kwargs)
            request.version, request.versioning_scheme = version, scheme
    
            # Ensure that the incoming request is permitted
            self.perform_authentication(request)  # 认证
            self.check_permissions(request)  # 权限检查
            self.check_throttles(request)  # 限流
    
    
        def list(self, request, *args, **kwargs):
            queryset = self.filter_queryset(self.get_queryset()) # 分步执行,等于下面两句
            # all_queryset = self.get_queryset()  # 获取所有的结果
            # queryset = self.filter_queryset(all_queryset)  # 过滤结果(可以是根据多种因素进行过滤,例如权限)
    
            page = self.paginate_queryset(queryset)  # 分页
            if page is not None:
                serializer = self.get_serializer(page, many=True)  # 对分页结果进行反序列化
                return self.get_paginated_response(serializer.data)  # 返回分页结果
    
            serializer = self.get_serializer(queryset, many=True)  # 反序列化
            return Response(serializer.data)  # 返回结果
    
    
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  • 原文地址:https://www.cnblogs.com/jijizhazha/p/13415127.html
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