Django Admin: How do I know when the user is editing an existing object or saving a new object?

Question

Hi guys, I would like to learn how to work with the Django Admin. How do I know when the user is editing an existing object or saving a new object?

For example, if I want to make a function to do something different when the user saves a new object or saves an edited object, how do I know which is which?

Thanks guys :)

Sorry for my English.

Answer 1

class MyModel(models.Model):

    def save(self):
        if self.id != None:
            print "Edited object"
        else:
            print "New object"
        super(MyModel, self).save()

Answer 2

You probably could do one of the following:

1. Listening for Django signals. In your case the pre_save signal could be useful.
2. Overwriting ModelAdmin.save_model
3. Overwriting your models save method like described by Adam