Signals can not connect to OneToOneField. #572
Description
Because django let sender = self.__class__:
https://github.com/django/django/blob/e9fd2b572410b1236da0d3d0933014138d89f44e/django/db/models/base.py#L860
If you inheritance from PeriodicTask(same as OneToOneField), and overwrite save() in your field, like this:
class YourPeriodicTask(PeriodicTask):
# ...
def save(self, *args, **kwargs):
# ...
super().save(*args, **kwargs)The pre_save.sender will be YourPeriodicTask, not PeriodicTask.
So, the signal will not be receive.