I'd like to make sure I'm on the right track.
Given a standard Invoice/Work order type app, where one model is the
Work Order and one is Line Items.
When I save line items, I want to calculate extended price (Quantity *
cost). Put that in the Line Items model, def save()
After the line item is saved, I want to call the Work Order to have it
update a Total Due column. Assuming I have the code in the Work Order
model to get all the related line items and sum the extended price,
what I would do is call the Work Order save() method from the Line
Item save() methd, after calling the super(save).
That is:
class LineItems(models.Model):
item = models.CharField(max_length=100)
wo = models.ForeignKey(WorkOrder)
def save(self):
doLocalMath()
super(LineItems, self).save()
WorkOrder.save()
And, sort of related, I need to call custom SQL to get the sum of
related records, correct?
Thanks.
- Lee
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