I'd like to build object relations (Model classes) without saving them
to the database to predict a price for a specific order. Let's say I
have this:
class Order(Model):
id = models.AutoField(primary_key=True)
number = models.IntegerField()
def total(self):
return sum([p.price for p in self.product_set])
class Product(Model):
id = models.AutoField(primary_key=True)
order = models.ForeignKey(Order)
price = models.DecimalField()
order = Order(number=1)
# Now the nex line throws an error if we did not save the order here
order.product_set.create(Product(price=20.0))
assert order.total() == 20.0
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