我有一个名为Event的django模型，它引用了Customer模型。
event_name = models.CharField(max_length=200, unique=True)
customer = models.ForeignKey(customer_models.Customer, db_index=True,
on_delete=models.SET_NULL,
related_name='customer_events', null=True)
event_location = models.CharField(max_length=200, default='')
event_date = models.DateField()
我需要获取客户列表以及API中每个用户的最新事件名称。
客户serializers.py文件是
class CustomerSerializer(serializers.ModelSerializer):
class Meta:
model = Customer
fields = '__all__'
客户views.py文件
class CustomerViewSet(viewsets.ModelViewSet):
queryset = Customer.objects.all()
serializer_class = CustomerSerializer
我该如何做到这一点？
答案 0 :(得分：2)
在var express = require("express");
var app = express();
var port = 54180;
var BinaryServer = require('binaryjs').BinaryServer;
var server = BinaryServer({
port: port
});
app.listen(port, function () {
console.log('server open on port ' + port);
});
binaryServer = BinaryServer({
port: 9001
});
binaryServer.on('connection', function (client) {
console.log('Binary Server connection started');
client.on('stream', function (stream, meta) {
console.log('>>>Incoming audio stream');
var speech = require('@google-cloud/speech')({
projectId: 'MYPROJECT-1234'
//keyFilename: '/config/KeyFile.json'
});
const request = {
config: {
encoding: 'LINEAR16',
sampleRate: 16000
},
singleUtterance: false,
interimResults: true
};
// Create a recognize stream
const recognizeStream = speech.createRecognizeStream(request)
.on('error', function (error) {
console.log('Error');
console.log(error)
})
.on('data', function (data) {
console.log('Data');
console.log(data);
});
// Send the microphone input to the Speech API
stream.pipe(recognizeStream);
stream.on('end', function () {
fileWriter.end();
recognizeStream.end();
console.log('||| Audio stream ended');
});
});
});
模型中，您可以使用Customer返回Customer实例的最新事件名称：
property在序列化程序中，您可以为class Customer(models.Model):
...
@property
def latest_event_name(self):
"""Return latest event name."""
# self.customer_events.order_by('event_date').last()
latest_event = self.customer_events.order_by('-event_date').first()
return latest_event.event_name if latest_event else None
添加ReadOnlyField：
latest_event_name