get_object 메서드

review 중에 get_object로 가져오면 자동으로 404 에러를 띄워주니까

404 에러를 raise 하지 말라는 리뷰를 받았다.

 

 

 

---

 

def get_object(self):
        """
        Returns the object the view is displaying.

        You may want to override this if you need to provide non-standard
        queryset lookups.  Eg if objects are referenced using multiple
        keyword arguments in the url conf.
        """
        queryset = self.filter_queryset(self.get_queryset())

        # Perform the lookup filtering.
        lookup_url_kwarg = self.lookup_url_kwarg or self.lookup_field

        assert lookup_url_kwarg in self.kwargs, (
            'Expected view %s to be called with a URL keyword argument '
            'named "%s". Fix your URL conf, or set the `.lookup_field` '
            'attribute on the view correctly.' %
            (self.__class__.__name__, lookup_url_kwarg)
        )

        filter_kwargs = {self.lookup_field: self.kwargs[lookup_url_kwarg]}
        obj = get_object_or_404(queryset, **filter_kwargs)

        # May raise a permission denied
        self.check_object_permissions(self.request, obj)

        return obj

 

위처럼 get_object() 메서드는 get_object_or_404() 메서드를 가져다가 쓰므로 내부적으로 404 처리를 한다.

 

def get_object_or_404(klass, *args, **kwargs):
    """
    Use get() to return an object, or raise an Http404 exception if the object
    does not exist.

    klass may be a Model, Manager, or QuerySet object. All other passed
    arguments and keyword arguments are used in the get() query.

    Like with QuerySet.get(), MultipleObjectsReturned is raised if more than
    one object is found.
    """
    queryset = _get_queryset(klass)
    if not hasattr(queryset, "get"):
        klass__name = (
            klass.__name__ if isinstance(klass, type) else klass.__class__.__name__
        )
        raise ValueError(
            "First argument to get_object_or_404() must be a Model, Manager, "
            "or QuerySet, not '%s'." % klass__name
        )
    try:
        return queryset.get(*args, **kwargs)
    except queryset.model.DoesNotExist:
        raise Http404(
            "No %s matches the given query." % queryset.model._meta.object_name
        )

get_object_or_404() 메서드는 object가 없으면 404 에러를 raise 한다.

그래서 get_object()를 사용하면 if else로 따로 raise error 처리를 안해줘도 된다.