Question

当尝试运行依赖Django代码的celery任务时，我似乎遇到了22个问题。

芹菜代码

from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
from django.conf import settings
from celery import shared_task
from celery import task
from letters.send_write_letter_reminders import send_write_letter_reminders

# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'app_name.settings')

app = Celery('app_name')

# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
#   should have a `CELERY_` prefix.
app.config_from_object('django.conf:settings', namespace='CELERY')

app.conf.timezone = 'Europe/London'
# Load task modules from all registered Django app configs.
app.autodiscover_tasks(settings.INSTALLED_APPS)

@app.task(bind=True, name='send_letter_reminders')
def send_letter_reminders(slug=None):
    send_write_letter_reminders(slug=slug)

我遇到的问题是该行

from letters.send_write_letter_reminders import send_write_letter_reminders

有了它我得到：

django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

应用服务器将无法运行，但是如果没有它，我将得到：

NameError: name 'send_write_letter_reminders' is not defined

很明显，我缺少有关如何同时运行Celery和Django的基本知识，但是我看不到。谁能启发我做错了什么？

更新我为此提出了一个解决方案，其中涉及将导入移动到celery任务中。我知道这不是最佳做法。也许这可能有助于解释发生了什么。

@app.task(bind=True, name='send_letter_reminders')
def send_letter_reminders(slug=None):
    from letters.send_write_letter_reminders import send_write_letter_reminders
    send_write_letter_reminders.send_write_letter_reminders(slug=slug)

Answer 1

从本质上讲，除非执行了import os from datetime import datetime now = datetime.now() time = now.strftime("%H:%M:%S") pinghost = input("you want to ping: ") print("Started " + time) response = os.system("ping -n 6 {}".format(pinghost)) if response == 0: print('ping complete.') print("Completed "+time) else: print('ping fail.')行，否则您将无法进行任何django导入或任何依赖django的导入。使用os.environ.setdefault运行任何内容时，您不必为此担心，原因是manage.py是manage.py的第一行。从本质上讲，只需将os.environ.setdefault和django.conf导入移动到letter下方，情况应该会更好。根据您所使用的django版本，您可能还需要在设置os.environ.setdefault后显式调用django.setup()来完成django设置。

无法运行取决于Django代码的celery任务

1 个答案: