Search code examples
pythondjangocelerydjango-celery

django-celery : TypeError: can only concatenate tuple (not "NoneType") to tuple

I have recently started using rabbitmq and celery with django. i am using django-celery, django-celery-email and post office to send emails in async way. After installing all these packages my settings.py looks like

INSTALLED_APPS = [
#other apps
'djcelery',
'djcelery_email',
'post_office'
]


# setup celery
import djcelery
djcelery.setup_loader()

# using post office as the default email backend 
EMAIL_BACKEND = 'post_office.EmailBackend'
# using djcelery's email backend as a backend for post office 

POST_OFFICE_BACKEND = 'djcelery_email.backends.CeleryEmailBackend'

POST_OFFICE = {
    'DEFAULT_PRIORITY' : 'now'
}

EMAIL_HOST = 'YOUR_HOST_NAME'
EMAIL_HOST_USER = "YOUR_HOST_USER_NAME"
EMAIL_PORT = 25  # default smtp port
EMAIL_HOST_PASSWORD = "YOUR_HOST_USER_PASSWORD"
EMAIL_USE_TLS = False
DEFAULT_FROM_EMAIL = '[email protected]'

when i am trying to run django-celery via command

**python manage.py celeryd**

It is throughing below error

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ubuntu/edyodavirtual/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/home/ubuntu/edyodavirtual/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 356, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/ubuntu/edyodavirtual/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 206, in fetch_command
    klass = load_command_class(app_name, subcommand)
  File "/home/ubuntu/edyodavirtual/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 40, in load_command_class
    module = import_module('%s.management.commands.%s' % (app_name, name))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/ubuntu/edyodavirtual/local/lib/python2.7/site-packages/djcelery/management/commands/celeryd.py", line 16, in <module>
    class Command(CeleryCommand):
  File "/home/ubuntu/edyodavirtual/local/lib/python2.7/site-packages/djcelery/management/commands/celeryd.py", line 20, in Command
    worker.get_options() +
TypeError: can only concatenate tuple (not "NoneType") to tuple

Anyone here help me to fix this

Solution

  • Even i was facing the same issue, where i was trying to integrate celery with django via djcelery package. Then i read many blogs and documentation and found below conclusion.

    "Previous versions of Celery required a separate library to work with Django, but since 3.1 this is no longer the case. Django is supported out of the box now"

    [Celery Notes][1]http://docs.celeryproject.org/en/latest/django/first-steps-with-django.html

    without using djcelery i wrote the tasks directly and it worked !