jezdez/celery-haystack — pull request #37 by ntucker (2014-11-11 05:05:32+00:00)
Title: Task must be instantiated

I was getting: unbound method apply_async() must be called with
CeleryHaystackSignalHandler instance as first argument (got tuple
instance instead)

After changing this it all worked fine. apply_async is not a classmethod - it has self as first argument