Django (DRF): How to do case-insensitive ordering

问题:

I have an api with ?ordering=name,type

I want both the name and the type to be as case-insensitive

class IngredientListAPIView(ListAPIView):
    queryset = Ingredient.objects.all()
    serializer_class = IngredientListSerializer
    filter_backends = [OrderingFilter]

回答1:

got the solution from https://github.com/encode/django-rest-framework/issues/3280

from django.db.models.functions import Lower
from rest_framework.filters import OrderingFilter


class CaseInsensitiveOrderingFilter(OrderingFilter):

    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

then use it in the ListView

class IngredientListAPIView(ListAPIView):
    queryset = Ingredient.objects.all()
    serializer_class = IngredientListSerializer
    filter_backends = [SearchFilter,CaseInsensitiveOrderingFilter]
    search_fields = ['name','slug']