django celery import function not working - django

Question

I have been trying to create a task for a while, which consists of creating a sample of a specimen every 5 hours. I have managed to configure celery with redis and execute the task that is as an example in the documentation but when I want to do something more complex that includes a query set it does not execute me.the task disappears from the list when restarting the queue.
this is the structure of the project:
proj:
Muestras:
-views.py
-tasks.py
-models.py
Servicios:
-models.py
proj:
-celery.py
-settings.py
In settings.py:
CELERY_BROKER_URL = 'redis://localhost:6379'
CELERY_RESULT_BACKEND = 'redis://localhost:6379'
CELERY_ACCEPT_CONTENT = ['application/json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TIMEZONE = 'Europe/London'
CELERY_BEAT_SCHEDULE = {
'generar-muestras': { # name of the scheduler
'task': 'Muestras.tasks.crear_muestras_tarea',
'schedule': 30.0, # set the period of running
},
}
This is a view that is within Muestras.views
from .models import Muestra
from backend.Servicios.models import Servicio
#this works in console
def generar_muestras():
services = Servicio.models.all()
for i in services:
muestra = Muestra(servicio_id=i.id)
muestra.save
In Muestras.tasks.py
from __future__ import absolute_import, unicode_literals
from celery import task
from .views import generar_muestras
#task
def crear_muestras_task():
print('hola esto tiene una funcion')
#generar_muestras()
this is what i have in celery.py:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
from django.conf import setting
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings')
app = Celery('proj')
app.config_from_object('django.conf:settings', namespace='CELERY')
app.autodiscover_tasks()
#app.task(bind=True)
def debug_task(self):
print('Request: {0!r}'.format(self.request))
and when execute
celery -A proj worker -l info -B
everything works well and executes the task but when I make this line in the Muestras.tasks.py and import from .views the view.
generar_muestras()
the task disappears from the list and i get this error:
[2018-11-04 22:31:37,734: INFO/MainProcess] celery#linux-z6z3 ready.
[2018-11-04 22:31:37,876: ERROR/MainProcess] Received unregistered task of
type 'Muestras.tasks.crear_muestras_tarea'.
The message has been ignored and discarded.
Did you remember to import the module containing this task?
Or maybe you're using relative imports?
Please see
http://docs.celeryq.org/en/latest/internals/protocol.html
for more information.
The full contents of the message body was:
b'[[], {}, {"callbacks": null, "errbacks": null, "chain": null, "chord":
null}]' (77b)
Traceback (most recent call last):
File "/home/wecbxxx/PycharmProjects/porj/venv/lib64/python3.6/site-
packages/celery/worker/consumer/consumer.py", line 558, in
on_task_received
strategy = strategies[type_]
KeyError: 'Muestras.tasks.crear_muestras_tarea'

Answer 1

You didn't share your settings.py or how you run the celery worker so I am taking a wild guess.
Your task should be listed under imports setting of celery. See here.
Your task should be decorated by #app.task(). See here
I suggest you go through celery's user guide. I think it can use some structural improvement but should be enough to understand the basics.

Answer 2

To expand on #gokhan's answer, there are two things that you should make sure of:
Decorate your task with #app.task
from __future__ import absolute_import, unicode_literals
from proj.celery import app
from .views import generar_muestras
#app.task
def crear_muestras_task():
print('hola esto tiene una funcion')
#generar_muestras()
Make sure that Muestras appears in settings.INSTALLED_APPS. This will allow the autodiscover to discover your tasks:
Next, a common practice for reusable apps is to define all tasks in a separate tasks.py module, and Celery does have a way to auto-discover these modules:
app.autodiscover_tasks()
With the line above Celery will automatically discover tasks from all of your installed apps, following the tasks.py convention: