Question

I’m wiring up a custom post_save signal and noticed that I can’t seem to find an easy way to pass a set of kwargs.

During the save itself (inside a custom form)

def save(self, commit=True):
    user = super(CustomFormThing, self).save(commit=False)
    #set some other attrs on user here ...
    if commit:
        user.save()

    return user

Then inside my custom post_save hook I have the following (but never get any kwargs)

@receiver(post_save, sender=User)
def create_profile(sender, instance, created, **kwargs):
    some_id = kwargs.get('some', None)
    other_id = kwargs.get('other', None)

    if created:
        #do something with the kwargs above...

How might I pass kwargs from the save to the post_save event?

Answer 1

Built-in signals are sent by Django, so you can’t control their kwargs.

You can:

1. Define and send your own signals.

2. Store additional info in model instance. Like this

   def save(self, commit=True):
       user = super(CustomFormThing, self).save(commit=False)
       #set some other attrs on user here ...
       user._some = 'some'
       user._other = 'other'
       if commit:
           user.save()
   
       return user
   
   @receiver(post_save, sender=User)
   def create_profile(sender, instance, created, **kwargs):
       some_id = getattr(instance, '_some', None)
       other_id = getattr(instance, '_other', None)
   
       if created:
           #do something with the kwargs above...