尝试从查询集中获取 return Id 时出现 AttributeError

Question

我正在构建一个 API 以从 Django 中的国际象棋棋盘获取一些信息，我有一个包含以下字段的模型：id、piece_name、颜色、initial_position。

型号

class ChessB(models.Model):

class Meta:

    db_table = 'chess'

id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
piece_name = models.CharField(max_length=200)
color = models.CharField(max_length=200)
initial_position = models.CharField(max_length=200)

序列化器

class ChessBSerializer(serializers.ModelSerializer):

class Meta:

    model = ChessB
    fields = '__all__'

VIEW

class ChessBList(generics.ListCreateAPIView):
serializer_class = ChessBSerializer

def get_queryset(self):
    queryset = ChessB.objects.all()
    piece_name = self.request.query_params.get('piece_name')
    if piece_name is not None:
        queryset = queryset.filter(piece_name=piece_name)
        queryset = queryset.values_list('id', flat=True)
    return queryset

我想做的是：通知我的 piece_name 作为参数，应该 return只是我的 Id

例如：调用 http://127.0.0.1:8000/chessb/?piece_name=queen 应该 return:

{
 "id":"id-from-queen-here"
}

但是当我尝试在我的视图上使用 values_list('id') 时，出现如下错误：

Internal Server Error: /chessb/
Traceback (most recent call last):
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\fields.py", line 457, in get_attribute
    return get_attribute(instance, self.source_attrs)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\fields.py", line 97, in get_attribute
    instance = getattr(instance, attr)
AttributeError: 'UUID' object has no attribute 'piece_name'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\luizg\Python\Python310\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
File "C:\Users\luizg\Python\Python310\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\luizg\Python\Python310\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
File "C:\Users\luizg\Python\Python310\lib\site-packages\django\views\generic\base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\views.py", line 509, in dispatch
    response = self.handle_exception(exc)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\views.py", line 480, in raise_uncaught_exception
    raise exc
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\generics.py", line 239, in get
    return self.list(request, *args, **kwargs)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\mixins.py", line 46, in list
    return Response(serializer.data)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\serializers.py", line 745, in data
    ret = super().data
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\serializers.py", line 246, in data
    self._data = self.to_representation(self.instance)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\serializers.py", line 663, in to_representation
    return [
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\serializers.py", line 664, in <listcomp>
    self.child.to_representation(item) for item in iterable
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\serializers.py", line 502, in to_representation
    attribute = field.get_attribute(instance)
File "C:\Users\luizg\Python\Python310\lib\site-packages\rest_framework\fields.py", line 490, in get_attribute
    raise type(exc)(msg)
AttributeError: Got AttributeError when attempting to get a value for field `piece_name` on serializer `ChessBSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `UUID` instance.
Original exception text was: 'UUID' object has no attribute 'piece_name'.

我这里的错误是什么？

Answer 1

get_queryset 应该 return 一个查询集……因此得名。您正在 returning 一个无效的 ID 列表。如果你想为 return 指定一组特定的字段，那应该放在序列化程序中。

class ChessBSerializer(serializers.ModelSerializer):
    class Meta:
        model = ChessB
        fields = ("id",)

尝试从查询集中获取 return Id 时出现 AttributeError

AttributeError when trying to return Id from queryset

python

django

django-models

django-views

django-rest-framework