@shared_task decorator doesn't work

Question

The problem: @shared_task decorator doesn't work, when I import data from custom files. I mean, when I start celery, all tasks under @shared_task doesn't appear in list of tasks.

For example, in this case @shared_task decorator doesn't work:

from __future__ import absolute_import, unicode_literals

from celery import shared_task

from .models import foo


@shared_task
def my_foo_backup(id):
    my_foo = foo(....)
    ...
    ...

This is example, when @shared_task works:

from __future__ import absolute_import, unicode_literals

from celery import shared_task


@shared_task
def my_foo_backup(id):
    my_foo = foo(....)
    ...
    ...

Why?!?

Did you write this code in "tasks.py"? Certainly, Celery only recognizes "tasks.py" as a task. see also http://docs.celeryproject.org/en/latest/reference/celery.html#celery.Celery.autodiscover_tasks — tell k, Apr 30 '17 at 10:59
yes, of course. Other way it will not add @shared_task to list of tasks in my second example. — Stas Navarici, Apr 30 '17 at 11:08

score 4 · Accepted Answer · answered May 03 '17 at 08:22

4

The solution to that problem was to move import commands inside the function. In that way it works fine and according to the rules of PEP8.

from __future__ import absolute_import, unicode_literals

from celery import shared_task


@shared_task
def my_foo_backup(id):
    from .models import foo

    my_foo = foo(....)
    ...
    ...

answered May 03 '17 at 08:22

Stas Navarici

93
8

This fixed my problem as well but I don't understand why it makes a difference. Can you elaborate? – leros Sep 13 '18 at 01:41
Some importing loop probably. – Stas Navarici Sep 18 '18 at 17:58

@shared_task decorator doesn't work

1 Answers1