celerybeat automatically disables periodic task - django

Question

I'd like to create a periodic task for celery using django-celery's admin interface. I have a task set up which runs great when called manually or by script. It just doesn't work through celerybeat. According to the debug logs the task is set to enabled = False on first retrieval and I wonder why.
When adding the periodic task and passing [1, False] as positional arguments, the task is automatically disabled and I don't see any further output. When added without arguments the task is executed but raises an exception instantly because I didn't supply the needed arguments (makes sense).
Does anyone see what's the problem here?
Thanks in advance.
This is the output after supplying arguments:
[DEBUG/Beat] SELECT "djcelery_periodictask"."id", [...]
FROM "djcelery_periodictask"
WHERE "djcelery_periodictask"."enabled" = true ; args=(True,)
[DEBUG/Beat] SELECT "djcelery_intervalschedule"."id", [...]
FROM "djcelery_intervalschedule"
WHERE "djcelery_intervalschedule"."id" = 3 ; args=(3,)
[DEBUG/Beat] SELECT (1) AS "a"
FROM "djcelery_periodictask"
WHERE "djcelery_periodictask"."id" = 3 LIMIT 1; args=(3,)
[DEBUG/Beat] UPDATE "djcelery_periodictask"
SET "name" = E'<taskname>', "task" = E'<task.module.path>',
"interval_id" = 3, "crontab_id" = NULL,
"args" = E'[1, False,]', "kwargs" = E'{}', "queue" = NULL,
"exchange" = NULL, "routing_key" = NULL,
"expires" = NULL, "enabled" = false,
"last_run_at" = E'2011-05-25 00:45:23.242387', "total_run_count" = 9,
"date_changed" = E'2011-05-25 09:28:06.201148'
WHERE "djcelery_periodictask"."id" = 3;
args=(
u'<periodic-task-name>', u'<task.module.path>',
3, u'[1, False,]', u'{}',
False, u'2011-05-25 00:45:23.242387', 9,
u'2011-05-25 09:28:06.201148', 3
)
[DEBUG/Beat] Current schedule:
<ModelEntry: celery.backend_cleanup celery.backend_cleanup(*[], **{}) {<crontab: 0 4 * (m/h/d)>}
[DEBUG/Beat] Celerybeat: Waking up in 5.00 seconds.
EDIT:
It works with the following setting. I still have no idea why it doesn't work with django-celery.
CELERYBEAT_SCHEDULE = {
"example": {
"task": "<task.module.path>",
"schedule": crontab(),
"args": (1, False)
},
}

Answer 1

I had the same issue. Make sure the arguments are JSON formatted. For example, try setting the positional args to [1, false] -- lowercase 'false' -- I just tested it on a django-celery instance (version 2.2.4) and it worked.
For the keyword args, use something like {"name": "aldarund"}

Answer 2

I got the same problem too.
With the description of PeriodicTask models in djcelery ("JSON encoded positional arguments"), same as Evan answer. I try using python json lib to encode before save.
And this work with me
import json
o = PeriodicTask()
o.kwargs = json.dumps({'myargs': 'hello'})
o.save()
celery version 3.0.11

Answer 3

CELERYBEAT_SCHEDULE = {
"example": {
"task": "<task.module.path>",
"schedule": crontab(),
"enable": False
},
}
I tried and it worked.I run on celery beat v5.1.2