Django Rest Framework序列化器create（）未触发 [英] Django Rest Framework serializer create() doesn't get triggered

问题描述

我有以下序列化器

class MyModelSerializer(serializers.ModelSerializer):
    user = UserSerializer()

    def create(self, validated_data):
        print("TEST")
        MyModel, created = MyModel.objects.get_or_create(**validated_data)
        return MyModel

    class Meta:
        model = MyModel
        fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'text',)

以及以下视图集：

class MyModelViewSet(viewsets.ModelViewSet):
    queryset = MyModel.objects.all()
    serializer_class = MyModelSerializer

当我向与指定视图集相对应的端点发出 POST 请求时， create（ ）方法完全没有作用。如您所见，我尝试在控制台 TEST 中打印出来，但什么也没做。

When I make an POST request to the endpoint corresponding to specified viewset, the create() method does absolutely nothing. I tried to print out in console TEST as you can see, but nothing.

有人对吗？

感谢advace！

编辑：
API调用：

API call:

return axios({
  method: 'post',
  url: 'http://localhost:8000/api/mymodel/',
  data: {
     title: this.title,
     movie: this.id,
     text: this.text,
     user: this.user
}

推荐答案

在ViewSet中执行POST处理，您可以找到以下内容：

If you look at the implementation of POST handling in a ViewSet, you can find this :

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

您的 create 方法是在序列化程序验证数据之后调用。

Your create method is called after serializer validates the data.

您看到的错误（用户已经存在）是调用 serializer.is_valid 从上面的代码段开始。

The error you see (user already exists) is a result of calling serializer.is_valid from the snippet above.

因此，它永远不会调用您的 create 。上面的代码段中，您的craee将被称为 self.perform_create（）的一部分。

Therefore, it never gets to call your create. Your craete would be called as part of self.perform_create() from this snippet above.

因此，这意味着您正在尝试创建一个已经存在的用户。因此，在您的模型中，您具有唯一的用户名。

So this means that you are trying to create a user which already exists. So in your model you have unique username.

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