I'm trying to create a simple invoice application where an Invoice has (0..n) LineItems.
I've created form that contains a few entries for line items, and using the standard AddManipulator I'm able to save a new invoice and its line items to the database. But I would like to add some code that performs a few calculations before the new objects are saved to the database: 1. for each LineItem, compute extended = quantity * unit_price 2. Invoice.subtotal = sum(LineItem.extended) 3. Invoice.taxAmount = sum(LineItem.extended if LineItem.isTaxable) * taxRate 4. Invoice.total = Invoice.subtotal + Invoice.taxAmount Writing recalc methods that perform these operations on the model objects is pretty simple, but how can I invoke such logic before the objects are actually saved in the database? Overriding save() in the model class doesn't work because db.models.manipulators.AutomaticManipulator.save() creates and saves the parent (Invoice) before creating the related children (LineItem). Is there a method to extract a new instance of a model object from the POST data without calling save()? Thanks for your help, Matthew --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
