[英]django-rest-framework- accepting id for submitted foreign key field
I have the following models:我有以下型号:
class Parent(models.Model):
name = models.CharField()
class Child(models.Model):
name = models.CharField()
parent = models.ForeignKey(Parent, on_delete=models.CASCADE)
with serializer:使用序列化器:
class ChildSerializer(serializers.ModelSerializer):
class Meta:
model = Child
fields = ('id', 'name', 'parent',)
read_only_fields = ('id',)
and ModelViewSet:和模型视图集:
class ChildViewSet(viewsets.ModelViewSet):
serializer_class = ChildSerializer
permission_classes = (IsAuthenticated,)
queryset = Child.objects.all()
paginator = None
If I query the api, I get a json structure that looks like:如果我查询 api,我会得到一个如下所示的 json 结构:
{
"id": 1,
"name": "Child Name",
"parent": 3
}
Which is exactly what I want.这正是我想要的。 However, if I try to PUT the same data back, I get the error:
ValueError: Cannot assign "3": "Child.parent" must be a "Parent" instance.
但是,如果我尝试将相同的数据放回去,我会收到错误:
ValueError: Cannot assign "3": "Child.parent" must be a "Parent" instance.
How can I make a submission like this work?我怎样才能提交这样的作品? I should be able to submit my data in the same way I receive it from the API.
我应该能够以与从 API 接收数据相同的方式提交我的数据。
You can use PrimaryKeyRelatedField
:您可以使用
PrimaryKeyRelatedField
:
Example from DRF Docs: DRF 文档中的示例:
class AlbumSerializer(serializers.ModelSerializer):
tracks = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
class Meta:
model = Album
fields = ['album_name', 'artist', 'tracks']
Your code would most likely be:您的代码很可能是:
class ChildSerializer(serializers.ModelSerializer):
parent = serializers.PrimaryKeyRelatedField(many=True)
class Meta:
model = Child
fields = ('id', 'name', 'parent',)
read_only_fields = ('id',)
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