Passing arguments django signals – post_save/pre_save

You can define additional arguments in custom save method of model like this:

class MyModel(models.Model):
    ....

    def save(self, *args, **kwargs):
        super(MyModel, self).save(*args, **kwargs)
        self.my_extra_param = 'hello world'

And access this additional argument through instance in post_save signal receiver:

@receiver(post_save, sender=MyModel)
def process_my_param(sender, instance, *args, **kwargs):
    my_extra_param = instance.my_extra_param