Serializing forms and formsets to pass to Celery task

I'm using Celery quite effectively with Django as many are. It's just awesome for running time consuming background tasks, and providing progress bar updates to a web page. Love it.

Now I would like a celery task to do some form processing. That is in a Django view, where I have access to the form (or formset) that's just been submitted, with all its data (in form.request.POST) and methods (like form.save() which saves it to the database as a Django object or objects (in the case of a formset).

Of course anything we pass to a Celery task must be serialized (as it's passed through the broker) and there is plenty of help around on serializing Django data objects but I can't find diddly squat on serialzing forms and every effort I've tried, JSON, pickle, dill, all fails.

I can serialize the POST data of course, and that great but I can't see how the Celery task can then re-instantiate a form object from that.

I posted this on stackoverflow as well with some richer detail: https://stackoverflow.com/questions/60433090/processing-a-django-form-in-a-celery-task-how-can-the-celery-task-see-the-form

I wonder if anyone has any experience to share here. Essentially I see two possible solutions:

1. Serialize the form or formsets somehow. Anything better than dill out there that might?
2. Serialize some part of the form or formsets (eg the POST data) and re-instantiate a form or formset at the other end using it.
   

Either approach would work, 1. would seem less hassle if it has a solution, and 2. seems more likely to provide one to me right now.

Kind regards,

Bernd.

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