Celery 的“autodiscover_tasks”函数的目的是什么？

Question

I'm wondering what is the purpose of Celery's autodiscover_tasks function. Im am using Celery 4.1.2 with Django 2.1.4.

The Celery documentation refers to imports:

foo.tasks and bar.tasks being imported

But I can't comprehend how this works.

All the examples I found on GitHub including this one from the Official Celery repo , rely on manually importing (ie from demoapp.tasks import add, mul, xsum ) the tasks even when calling the autodiscover_tasks function when booting the worker.

I guess this is how Python work, you can't access to classes "globally", like in Ruby, for example.

Then once again, what is this function for? I'm no expert at Celery and maybe I am missing something. The only thing I see is the name of the discovered tasks when launching the Celery worker, is that all this function is supposed to do?

Thanks for your inputs,

Answer 1

When using celery with django, the autodiscover_tasks function registers all decorated tasks within the task module inside each INSTALLED_APPS entry. eg,

if your INSTALLED_APPS settings included app1, app2, and app3, celery would automatically register any decorated tasks that could be found by looking at app1.tasks , app2.tasks , and app3.tasks .