Question

Sorry for some crazy subj.

I’d like to override django models save method and call some additional code if the model instance is newly created.
Sure I can use signals or check if the model have empty pk field and if yes, create temporary variable and later call a code:

Class EmailModel(models.Model):
    email = models.EmailField()

    def save(self, *args, **kwargs)
        is_new = self.pk is None
        super(EmailModel, self).save(*args, **kwargs)
        # Create necessary objects
        if is_new:
            self.post_create()

    def post_create(self):
          # do job, send mails
          pass

But I like to have some beautiful code and avoid using temporary variable in save method.
So the question is: is it possible to find if the instance of model is newly created object just after super save_base parent method call?

I’ve checked django sources can’t find how to do that in right way.

Thanks

We have related post

Answer 1

For real – signals are best approch in this case.

You could use post_save() signal and in the listener just check if the credit_set exist for current model instance and if not – create one. That would be my choice – there is no need to overdo such a simple task.

Of course if you really need to know exactly when the model was initiated (I doubt it) use post_init() signal. You don’t need to override save() method just to set some additional variables. Just catch post_init() signal, or pre_save(), and just change/add what you want. IMHO there is no sense to override save() method and check if this is new instance or not – that’s why the signals are there.