I'm writing an app to deal with checking out textbooks to students. The
models are
Title:
the book
PurchaseGroup:
when purchased and how much they cost, foreign key to Title
Copy:
number, foreign key to PurchaseGroup
I'd like to make it so that no two copies have the same number and
title, i.e. copies #1 and #2 of The Django Book are legal as is copy #1
of The Mythical Man-Month, but having two copy #1's of the same book
would be forbidden.
Will the ORM do that, or do I have to just write a check in the Copy
class's save method?
Thanks!
Todd
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