django rest framework 一個請求的大致處理流程
阿新 • • 發佈:2020-08-01
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) # 建立 Request 物件 self.request = request self.headers = self.default_response_headers # deprecate? try: self.initial(request, *args, **kwargs) # 依次進行,認證,許可權檢查,限流檢查 # 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) # 進入 GET, POST, PATCH, PATCH 等 View 下面的各個方法的處理邏輯 except Exception as exc: response = self.handle_exception(exc) self.response = self.finalize_response(request, response, *args, **kwargs) # 對 response 物件進行進一步處理 return self.response # 返回給客戶端
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) # 認證 self.check_permissions(request) # 許可權檢查 self.check_throttles(request) # 限流
def list(self, request, *args, **kwargs): queryset = self.filter_queryset(self.get_queryset()) # 分步執行,等於下面兩句 # all_queryset = self.get_queryset() # 獲取所有的結果 # queryset = self.filter_queryset(all_queryset) # 過濾結果(可以是根據多種因素進行過濾,例如許可權) page = self.paginate_queryset(queryset) # 分頁 if page is not None: serializer = self.get_serializer(page, many=True) # 對分頁結果進行反序列化 return self.get_paginated_response(serializer.data) # 返回分頁結果 serializer = self.get_serializer(queryset, many=True) # 反序列化 return Response(serializer.data) # 返回結果