Feature Request: Allow model @property methods to be serialized.

[Oroku Saki]

Let's say I have this class:

class Cart(models.Model):
    account = models.ForeignKey(Account)
    
    @property
    def total(self):
        total = 0
        for item in self.item_set:
            total += item.price
        return total

Obviously if I were to serialize this model, I would want the total to be serialized. I wouldn't mind having to include it in fields=() argument of serialize().

[Russell Keith-Magee]

I'm going to call this a duplicate of #5711; that ticket talks about extra() specifically, but the ticket discussion raises the issue of serializing arbitrary properties on a model.