在Django Rest FrameWork中'many = True'是做什么的？ [英] What does 'many = True' do in Django Rest FrameWork?

问题描述

我现在正在学习DRF，对此 many = True 代码有点困惑。它有什么作用？还是什么意思？

I am learning DRF now, im little puzzuled by this many = True code. What does it do? Or what does it mean?

示例1

class AlbumSerializer(serializers.ModelSerializer):
    tracks = serializers.RelatedField(many=True)

    class Meta:
        model = Album
        fields = ('album_name', 'artist', 'tracks')

示例2

class UserList(generics.ListCreateAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer
    permission_classes = (IsAdminUser,)

    def list(self, request):
        # Note the use of `get_queryset()` instead of `self.queryset`
        queryset = self.get_queryset()
        serializer = UserSerializer(queryset, many=True)
        return Response(serializer.data)

推荐答案

我认为您将 many = True 与很多对千真万确的混淆，但是这些概念并非如此

I think you are confusing many=True with many to many realtionship, but the concepts is not like that

通过设置 many = Tr ue ，您告诉drf queryset包含多个项目（项目列表），因此drf需要使用序列化程序类（和 serializer.data 将是列表）

by setting many=True you tell drf that queryset contains mutiple items (a list of items) so drf needs to serialize each item with serializer class (and serializer.data will be a list)

如果未设置此参数，则表示queryset是单个实例，而 serializer.data 将是单个对象）

if you don't set this argument it means queryset is a single instance and serializer.data will be a single object)

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