django hook into get method / update field of object when object is called

Question

Hi,

I have an Invoice model with a boolean field: is_overdue . This field is set to True if the user did not receive a payment and the due_date is before the date of today.

Now I want to accomplish that this field is regularly updated. Ok one possibility is to update the field when the save method is called.

But how can I ensure that if the object is "called" (presented at the portal), that the is_overdue field is set correctly. Since I can not force the user to save the object before viewing the object ;-)

It would be great if it would be possible to overwrite the get object method and set the field there accordingly. With "get object method" I mean the call Invoice.objects.all() or similar..

Answer 1

Make is_overdue a property that checks if the payment has been made and returns the appropriate value.