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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