Django的REST框架list_route和查询集树结构

Question

试图通过DRF串行显示类别的层次结构和它失败

GET /api/mobile/v1/categories/tree/ HTTP/1.1 
Host: localhost:8000 
Accept: application/json 
Content-Type: application/json 
Cache-Control: no-cache 
Postman-Token: c6b6c0e4-18f3-f8c4-1d77-75fc21a6a431 

builtins.AttributeError

AttributeError: Got AttributeError when attempting to get a value for field `id` on serializer `CategoryTreeSerializer`. The serializer field might be named incorrectly and not match any attribute or key on the `TreeQuerySet` instance. Original exception text was: 'TreeQuerySet' object has no attribute 'id'. 

视图集

class CategoryViewSet(
     mixins.ListModelMixin, 
     viewsets.GenericViewSet 
): 
    """Category view set. 

    List model viewset for ``Category`` model. 

    """ 
    queryset = Category.objects.all() 
    serializer_class = CategorySerializer 
    pagination_class = None 

    @decorators.list_route(methods=['get']) 
    def tree(self, *args, **kwargs): 

     categories = Category.objects.filter(parent=None).all() 
     serializer = CategoryTreeSerializer(categories) 
     return Response(status=status.HTTP_200_OK, data=serializer.data 

我的型号

class Category(MPTTModel): 

    id = models.CharField(
     max_length=32, 
     primary_key=True, 
     unique=True, 
     verbose_name=_('ID'), 
     help_text=_('Forsquare ID of the category.'), 
    ) 
    parent = TreeForeignKey(
     'self', 
     blank=True, 
     null=True, 
     related_name='children', 
     db_index=True, 
     verbose_name=_('Parent category'), 
     help_text=_('Parent category.'), 
    ) 
    name = models.CharField(max_length=255, verbose_name=_('Name')) 
    plural_name = models.CharField(
     max_length=255, 
     verbose_name=_('Plural name') 
    ) 

    class Meta: 
     verbose_name = _('Category') 
     verbose_name_plural = _('Categories') 

    class MPTTMeta: 
     order_insertion_by = ['name'] 

    def __str__(self): 
     return self.name 

串行

class CategoryTreeSerializer(serializers.ModelSerializer): 
    """Category serializer. 

    Serializer for ``Category`` model. Excludes fields specified for MPTT. 

    """ 
    children = serializers.ListField(child=RecursiveField()) 

    class Meta: 
     model = Category 
     fields = ('id', 'name', 'plural_name', 'children',) 

Answer 1

确定工作的以下变化

class CategoryViewSet(
     mixins.ListModelMixin, 
     UserFavoritesMixin, 
     viewsets.GenericViewSet 
): 
    """Category view set. 

    List model viewset for ``Category`` model. 

    """ 
    queryset = Category.objects.all() 
    serializer_class = CategorySerializer 
    pagination_class = None 

    @decorators.list_route(methods=['get']) 
    def tree(self, *args, **kwargs): 
     """ 
     """ 
     categories = Category.objects.filter(level=0).all() 
     serializer = CategoryTreeSerializer(categories, many=True) 
     return Response(status=status.HTTP_200_OK, data=serializer.data) 


class CategoryTreeSerializer(serializers.ModelSerializer): 
    """Category serializer. 

    Serializer for ``Category`` model. Excludes fields specified for MPTT. 

    """ 
    children = RecursiveField(many=True) 

    class Meta: 
     model = Category 
     fields = ('id', 'name', 'plural_name', 'children',) 

后