Celery: auto discovery does not find tasks module in app

Question

I have the following setup with a fresh installed celery and django 1.4:

settings.py:

import djcelery
djcelery.setup_loader()

BROKER_HOST = \'localhost         


        

Answer 1

I'm pretty sure you have to import the "Celery app instance" and declare a task like this:

from project_name.celery import app

@app.task
def video_process_task(video_id):
    pass

note that there's a celery.py file in the project_dir/project_name folder, which declares the celery instance, like this:

from __future__ import absolute_import
import os
from celery import Celery
from django.conf import settings

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'project_name.settings')
app = Celery('project_name')
app.config_from_object('django.conf:settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)

as instructed in the official documentation.

also, you must register the task, in one of these three ways:

• the CELERY_IMPORTS variable in Django project's settings.py file as in dgel's answer
• passing bind=True to the decorator like: @app.task(bind=True)
• if you set autodiscovery for celery like it is done above in the line app.autodiscover_tasks(lambda: settings.INSTALLED_APPS) , each Django application's folder can contain a tasks.py file, and the tasks declared inside it will be automatically registered

note that changes to the tasks REQUIRE A CELERY RESTART to take effect