Django signals created kwargs is True while updating

[Aamu Padi]

I think I am missing something here, but here it goes. I have a model, and it is a sender for a post_save signal.

class Book(models.Model):

    ...

    created_at = models.DateTimeField(default=timezone.now)

    bought = models.BooleanField(default=False)

@receiver(post_save, sender=Book)

def create_sold_log(sender, instance, **kwargs):

    if kwargs['created'] and instance.bought:

        print('created and instance.bought')

        print('k* created', kwargs['created'])

    elif kwargs['created']:

        print('created only')

        print('k* created', kwargs['created'])

    else:

        print('else...')

Now everytime a book object is saved, the above signal will fire.

So from the below data, after the serializer is saved while the Bought is True, the kwargs['created'] is True.

data = {

    "...": "...",

    "bought": True

}

serializer = CustomSerializer(data=data)

if serializer.is_valid():

    serializer.save()

And suppose, from the below data, if the bought=False and I save the serializer, then also kwargs['created'] is True.

data = {

    "...": "...",

    "bought": False

}

serializer = CustomSerializer(data=data)

if serializer.is_valid():

    serializer.save()

But, suppose, later if I update the book object to Bought=True and save it, the kwargs['created'] is still True.

book.bought = True

book.save()

What am I missing here? Can someone please help me understand. Thank you