你好，我有品牌模型和品牌编辑器模型，它们被用作面具来收集公司的所有个人品牌。我想将Brand添加到用户的BrandEditor中，这将创建品牌实例，如果没有BrandEditor，请先创建它。输入验证码：
class BrandAddSerializer(serializers.ModelSerializer):
editor = serializers.SerializerMethodField('create_editor')
class Meta:
model = Brand
fields = ('id', 'editor', 'name', 'image', 'description')
def create_editor(self):
if BrandEditor.objects.filter(owner__user=CurrentUserDefault).exists():
editor = BrandEditor.objects.filter(owner__user=CurrentUserDefault)
return editor
else:
company = Company.objects.filter(user=CurrentUserDefault)
BrandEditor.objects.create(owner=company)
editor = BrandEditor.objects.filter(owner__user=CurrentUserDefault)
return editor
我抓到create_editor() takes 1 positional argument but 2 were given，我在做什么错？谢谢！
答案 0 :(得分：2)
绑定到const http = require('http');
const EventEmitter = require('events');
const kafka = require('kafka-node');
const uuidv4 = require('uuid/v4');
const kafkaProduceTopic = "req-res-topic";
const kafkaConsumeTopic = "req-res-topic";
class ResponseEventEmitter extends EventEmitter {}
const responseEventEmitter = new ResponseEventEmitter();
var HighLevelProducer = kafka.HighLevelProducer,
client = new kafka.Client(),
producer = new HighLevelProducer(client);
var HighLevelConsumer = kafka.HighLevelConsumer,
client = new kafka.Client(),
consumer = new HighLevelConsumer(
client,
[
{ topic: kafkaConsumeTopic }
],
{
groupId: 'my-group'
}
);
var s = http.createServer(function (req, res) {
// Generate a random UUID to be used as the request id that
// that is used to correlated request/response requests.
// The internal micro-services need to include this id in
// the "final" message that is pushed to Kafka and consumed
// by the ui service
var id = uuidv4();
// Send the request data to the internal back-end through Kafka
// In real code the Kafka message would be a JSON/protobuf/...
// message, but it needs to include the UUID generated by this
// function
payloads = [
{ topic: kafkaProduceTopic, messages: id},
];
producer.send(payloads, function (err, data) {
if(err != null) {
console.log("Error: ", err);
return;
}
});
responseEventEmitter.once(id, () => {
console.log("Got the response event for ", id);
res.write("Order " + id + " has been processed\n");
res.end();
})
});
s.timeout = 10000;
s.listen(8080);
// Listen to the Kafka topic that streams messages
// indicating that the request has been processed and
// emit an event to the request handler so it can finish.
// In this example the consumed Kafka message is simply
// the UUID of the request that has been processed (which
// is also the event name that the response handler is
// listening to).
//
// In real code the Kafka message would be a JSON/protobuf/... message
// which needs to contain the UUID the request handler generated.
// This Kafka consumer would then have to deserialize the incoming
// message and get the UUID from it.
consumer.on('message', function (message) {
responseEventEmitter.emit(message.value);
});
的方法将object作为第二个参数。因此，您需要这样定义它：
SerializerMethodFieldUPD
def create_editor(self, obj):
也是用于向序列化器字段提供默认值的类。要让当前用户使用方法，可以改用此方法（文档related part）：
CurrentUserDefault