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
