django - celery parallel tasking error 'no result backend configured' -

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running django-celery 3.1.16, celery 3.1.17, django 1.4.16. trying run parallel tasks using 3 workers , collect results using following:

from celery import group  positions = [] jobs = group(celery_calculate_something.s(data.id) data in a_very_big_list) results = jobs.apply_async() positions.extend(results.get())

the task celery_calculate_something returns object place in results list:

app.task(ignore_result=false) def celery_calculate_something(id):   <do stuff>

no matter try, same result when calling get() on results:

no result backend configured.  please see documentation more information.

however, results backend configured - have many other tasks ignore_result=false merrily adding tasks meta table in django_celery. using results returned group(). should note not set explicitly in settings - seems django-celery has set automatically you.

i have worker collecting events using:

manage.py celery worker -l info -e

and celerycam running 

python manage.py celerycam

inspecting results object returned (an instance of groupresult) can see backend attr instance of disabledbackend. problem? have mis-understood?

you did not configure results backend, need tables store results, since have django-celery add installed_apps in settings.py file , perform migration (python manage.py migrate) after open celery.py file , modify backend djcelery.backends.database:databasebackend.
here's example 

app = celery('almanet',  broker='amqp://guest@localhost//',  backend='djcelery.backends.database:databasebackend',  include=['alm_crm.tasks'] #references tasks. donc forget put whole absolute path.  )

after can import results from celery import result can save result , extract result job.id

from celery import group positions = [] jobs = group(celery_calculate_something.s(data.id) data in a_very_big_list) results = jobs.apply_async() results.save() some_task_result = result.groupresult.restore(results.id) print some_task_results.ready()

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