Django的休息框架：對於不同的領域

Question

下面我有一個簡單的模型不同orderingfilter：

class Ingredient(models.Model): 
    name = models.CharField(max_length=30) 

我使用Django的休息框架API端點。

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

我希望我的兩個端點，以輸出爲：

?ordering=name -- i want the ordering to be case-insensitive 
?ordering=-name -- i want the ordering to be case-insensitive 

只有這樣，才能實現這一目標是創建

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 

然後

class IngredientListAPIView(ListAPIView): 
    queryset = Ingredient.objects.all().order_by(Lower('name')) 
    serializer_class = IngredientListSerializer 
    filter_backends = [CaseInsensitiveOrderingFilter] 

但現在當我訪問以下端點

?ordering=id -- it shows 1,10,11,12 
?ordering=-id -- it shows 99,98 ..100.. 

如果我使用filter_backends = [OrderingFilter]代替filter_backends = [CaseInsensitiveOrderingFilter]

?ordering=id -- it shows 1,2,3,4, 
?ordering=-id -- it shows 220,221,220 

所以如何告訴Django使用

filter_backends = [CaseInsensitiveOrderingFilter] for name field and 
filter_backends = [OrderingFilter] for id field 

Answer 1

我建議有不區分大小寫領域特定的類屬性

class IngredientListAPIView(ListAPIView): 
    queryset = Ingredient.objects.all().order_by(Lower('name')) 
    serializer_class = IngredientListSerializer 
    filter_backends = [CaseInsensitiveOrderingFilter] 
    ordering_fields =() # include both normal and case insensitive fields 
    ordering_case_insensitive_fields =() # put here only case insensitive fields 

然後自定義排序類將是：

class CaseInsensitiveOrderingFilter(OrderingFilter): 

    def filter_queryset(self, request, queryset, view): 
     ordering = self.get_ordering(request, queryset, view) 
     insensitive_ordering = getattr(view, 'ordering_case_insensitive_fields',()) 

     if ordering: 
      new_ordering = [] 
      for field in ordering: 
       if field in insensitive_ordering: 
        new_ordering.append(Lower(field[1:]).desc() if field.startswith('-') else Lower(field).asc()) 
       else: 
        new_ordering.append(field) 
      return queryset.order_by(*new_ordering) 

     return queryset 

Answer 2

views.py

class IngredientListAPIView(ListAPIView): 
    queryset = Ingredient.objects.all() 
    serializer_class = IngredientListSerializer 

    def filter_queryset(self, queryset): 
     if "name" in self.request.query_params.get("ordering"): 
      return CaseInsensitiveOrderingFilter().filter_queryset(self.request, queryset, self) 
     else: 
      queryset = OrderingFilter().filter_queryset(self.request, queryset, self) 
      return SearchFilter().filter_queryset(self.request, queryset, self)