Django Signals, Implementing On Save Listner

am having difficulties understanding how signals works, I went through some pages but none of them helped me get the picture. I have two models, I would like to create a signal th

Solution 1:

With the code below you can connect the save of an Instance object, with the after_save_instance_handler method. In this method you create the relation to the Audit. Please also see the generic relations doc

I usually add the signals in the models.py where the sender has been defined. Not sure if this is needed.

from django.db.models.signals import post_save

#####SIGNALS######defafter_save_instance_handler(sender, **kwargs):
    #get the saved instance
    instance_object = kwargs['instance']

    #get the needed data
    the_date = ...
    the_user = ...
    the_object_id = ...

    #create the relation to the audit object
    instance_object.audit_obj.create(operation="op963",operation_at=the_date,operation_by=the_user,object_id=the_object_id)

#connect the handler with the post save signal - django 1.1 + 1.2
post_save.connect(after_save_instance_handler, sender=Instances)

django 1.2 signals

in django development version they added a decorator to connect the signal. thus instead of the call above you have to add this decorator to the handler

@receiver(post_save, sender=Instances)defafter_save_instance_handler(sender, **kwargs):

django dev signals