I want to have a case-insensitive orderingfilter for name field so i have
created a class CaseInsensitiveOrderingFilter which extends OrderingFilter:
```
class CaseInsensitiveOrderingFilter(OrderingFilter):
ordering_fields = ('name')
def filter_queryset(self, request, queryset, view):
ordering = self.get_ordering(request, queryset, view)
if ordering:
new_ordering = []
for field in ordering:
if field.startswith('-'):
new_ordering.append(Lower(field[1:]).desc())
else:
new_ordering.append(Lower(field).asc())
return queryset.order_by(*new_ordering)
return queryset
```
and then use it in the ListApiView
```
class IngredientListAPIView(ListAPIView):
queryset = Ingredient.objects.all()
serializer_class = IngredientListSerializer
filter_backends = [SearchFilter,CaseInsensitiveOrderingFilter]
```
then i try the endpoint:
http://127.0.0.1:8000/api/ingredients/?ordering=-name
It does not sort the queryset w.r.t name field.
When i debig I found that:
```
fields = [param.strip() for param in params.split(',')] --
['name]
ordering = self.remove_invalid_fields(queryset, fields, view)
---- []
```
why ordering = []
where as removing ordering_filters inside CaseInsensitiveOrderingFilter,
sorts any field with CaseInsensitiveOrderingFilter
```
class CaseInsensitiveOrderingFilter(OrderingFilter):
### ordering_fields = ('name')
print(ordering_fields)
def filter_queryset(self, request, queryset, view):
ordering = self.get_ordering(request, queryset, view)
if ordering:
new_ordering = []
for field in ordering:
if field.startswith('-'):
new_ordering.append(Lower(field[1:]).desc())
else:
new_ordering.append(Lower(field).asc())
return queryset.order_by(*new_ordering)
return queryset
```
HOw to pass the ordering_fields to the extended class of OrderingFilter
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