Restful framework【第二篇】APIView

安装djangorestframework
djangorestframework的APIView分析
djangorestframework的Request对象简单介绍

回到顶部

安装djangorestframework#

方式一：pip3 install djangorestframework

方式二：pycharm图形化界面安装

方式三：pycharm命令行下安装（装在当前工程所用的解释器下）

回到顶部

djangorestframework的APIView分析#

as_view方法#

@classmethod
   def as_view(cls, **initkwargs):
       """
       Store the original class on the view function.
 
       This allows us to discover information about the view when we do URL
       reverse lookups.  Used for breadcrumb generation.
       """
       if isinstance(getattr(cls, 'queryset', None), models.query.QuerySet):
           def force_evaluation():
               raise RuntimeError(
                   'Do not evaluate the `.queryset` attribute directly, '
                   'as the result will be cached and reused between requests. '
                   'Use `.all()` or call `.get_queryset()` instead.'
               )
           cls.queryset._fetch_all = force_evaluation
 
       view = super(APIView, cls).as_view(**initkwargs)
       view.cls = cls
       view.initkwargs = initkwargs
 
       # Note: session based authentication is explicitly CSRF validated,
       # all other authentication is CSRF exempt.
       return csrf_exempt(view)

dispatch#

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)
        self.request = request
        self.headers = self.default_response_headers  # deprecate?
 
        try:
            self.initial(request, *args, **kwargs)
 
            # 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)
 
        except Exception as exc:
            response = self.handle_exception(exc)
 
        self.response = self.finalize_response(request, response, *args, **kwargs)
        return self.response

initialize_request#

def initialize_request(self, request, *args, **kwargs):
        """
        Returns the initial request object.
        """
        parser_context = self.get_parser_context(request)
 
        return Request(
            request,
            parsers=self.get_parsers(),
            authenticators=self.get_authenticators(),
            negotiator=self.get_content_negotiator(),
            parser_context=parser_context
        )

initial方法（内部调用认证，权限和频率）#

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)
       self.check_permissions(request)
       self.check_throttles(request)