芹菜（4.2）：如何获取当前任务的任务ID

Question

目标

出于闹钟的目的，我试图“获取”由User 在SetAlarmForm 中创建的特定Alarm。

从同一主题的其他答案（Q1、Q2、Q3）中，我正在尝试这条线：objx = Alarm.objects.get(id=run_alarm.request.id)。也许，我遗漏了一些明显的东西，或者 Celery 的版本已经更新？

错误

[ERROR/ForkPoolWorker-2] raised unexpected: DoesNotExist('Alarm matching query does not exist')

代码

Models.py

class Alarm(models.Model):
    """ Model representing each Alarm """
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

Views.py

class AlarmCreateView(LoginRequiredMixin, CreateView):
    """ CreateView for User to create the Alarm object """
    model = Alarm
    form_class = SetAlarmForm
    template_name = 'weather_alarm/set_alarm.html'
    login_url = "/login/"

    def form_valid(self, form):
        self.create_alarm_object(self.request, form)
        run_alarm.delay()
        return HttpResponseRedirect(self.get_success_url())

Tasks.py

import time
from celery import Celery, shared_task, current_task
from datetime import datetime

from .models import Alarm


@shared_task
def run_alarm():
    """ Function to organise the steps for the alarm using Celery """
    objx = Alarm.objects.get(id=run_alarm.request.id)
    second_countdown = objx.get_alarm_length() # get the length of the alarm, in seconds
    time.sleep(second_countdown) # wait for the alarm time
    conditions_satisfied = objx.check_conditionals() # check if conditionals are satisfied
    if conditions_satisfied == True:                    # conditions are satified
        print("Ring ring!")
        return True
    else:                                               # conditions aren't satisfied
        print("I'm only sleeping!")
        return True

Answer 1

解决此问题的最简单方法是使 alarmID 成为传递给您的任务的参数：

Tasks.py

@shared_task
def run_alarm(alarmID):
    objx = Alarm.objects.get(id = alarmID)

在视图中调用任务时需要传递此 ID：

Views.py

...
def form_valid(self, form):
    #making an assumption about what create_alarm_object returns here; you get the idea
    newAlarm = self.create_alarm_object(self.request, form)
    run_alarm.delay(newAlarm.id)

请注意如何将参数传递给run_alarm，方法是在此处将其传递给delay。延伸阅读：http://docs.celeryproject.org/en/latest/userguide/calling.html#example

您遇到错误的原因是request.id 将指向正在运行的单个异步 celery 任务的任务 ID，而不是警报对象的 ID。延伸阅读：http://docs.celeryproject.org/en/latest/userguide/tasks.html?highlight=request#task-request