OrderingFilter没有属性filter_queryset

Question

我一直想让OrderingFilter工作。从django rest framework页面中的示例来看，应该相当简单：

class UserListView(generics.ListAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer
    filter_backends = (filters.OrderingFilter,)
    ordering_fields = ('username', 'email')

但是，当我尝试这样做时：

from django_filters.rest_framework import DjangoFilterBackend, FilterSet, OrderingFilter
...


class ListingViewSet(viewsets.ModelViewSet):
    queryset = Listing.objects.all()
    serializer_class = ListingSerializer
    filter_backends = (DjangoFilterBackend, OrderingFilter,)
    filter_class = ListFilter
    ordering_fields = ('price', 'views')
    ordering = ('price',)

我得到一个关于OrderingFilter没有filter_queryset属性的错误：

ERROR 2016-11-13 03:14:57,304 log 25913 123145338523648 (<class 'AttributeError'>, AttributeError("'OrderingFilter' object has no attribute 'filter_queryset'",), <traceback object at 0x106ef48c8>)
Traceback (most recent call last):
  File "/.../lib/python3.5/site-packages/rest_framework/views.py", line 474, in dispatch
    response = handler(request, *args, **kwargs)
  File "/.../lib/python3.5/site-packages/rest_framework/mixins.py", line 40, in list
    queryset = self.filter_queryset(self.get_queryset())
  File "/.../lib/python3.5/site-packages/rest_framework/generics.py", line 151, in filter_queryset
    queryset = backend().filter_queryset(self.request, queryset, self)
AttributeError: 'OrderingFilter' object has no attribute 'filter_queryset'

进入OrderingFilter时，它确实没有filter_queryset方法，但视图希望它：

# in GenericAPIView(views.APIView)
def filter_queryset(self, queryset):
    """
    Given a queryset, filter it with whichever filter backend is in use.

    You are unlikely to want to override this method, although you may need
    to call it either from a list view, or from a custom `get_object`
    method if you want to apply the configured filtering backend to the
    default queryset.
    """
    for backend in list(self.filter_backends):
        queryset = backend().filter_queryset(self.request, queryset, self)
    return queryset

我在django rest framework queryset doesn't order中尝试过各种解决方案，但它们似乎也不起作用。我试着更新最有希望的答案：

class YOUR_VIEW_SET(viewsets.ModelViewSet):
    #your code here
    ordering_filter = OrderingFilter()

    def filter_queryset(self, queryset):
        queryset = super(YOUR_VIEW_SET, self).filter_queryset(queryset)
        return self.ordering_filter.filter_queryset(self.request, queryset, self)

由于OrderingFilter没有filter_queryset方法，我将filter_queryset更改为filter（它确实有），但此调用似乎与OrderingFilter中filter的签名冲突：

# In OrderingFilter(BaseCSVFilter, ChoiceFilter)
def filter(self, qs, value):
    if value in EMPTY_VALUES:
        return qs

    ordering = [self.get_ordering_value(param) for param in value]
    return qs.order_by(*ordering)

我不知道函数声明中的value应该是什么，所以我可以尝试将它传递给函数，但是qs似乎引用了queryset，所以我假设应该是第一个参数而不是第二个参数，但是，我不完全确定value应该是什么；这似乎不是请求，因为它是不可接受的。

如果我错过了一些显而易见的东西，我会非常感谢你的任何建议、想法或解决办法；我对Django不是很熟悉。

Answer 1

我自己也碰到过！

不要使用django_过滤器中的类，而是使用rest_framework.filters.OrderingFilter。

from rest_framework.filters import OrderingFilter
from django_filters.rest_framework import DjangoFilterBackend, FilterSet
...