Upgrade to Celery 4.x

[bartdag]

[pieterdd]

Had a brief look into this while playing with tox's dependency matrix, and these are the issues I've found so far:

• Under Celery 4 there's an error at https://github.com/resulto/django-celery-fulldbresult/blob/master/django_celery_fulldbresult/init.py#L77 (TypeError('update() argument after ** must be a mapping, not tuple',), I assume this is due to this change in format)
• django-celery is a dependency, but it doesn't support Celery 4

[bartdag]

Your second point is the major one. They created a completely new project and they split the periodic task and the task result models into two projects. This is going to be interesting. I'm not even sure it is possible to migrate gracefully.

[alexlopes]

Hi @bartdag @pieterdd any news about this?

[pieterdd]

I don't have the relevant domain knowledge to do this, and I don't know if it's even feasible.