Hands-On Software Engineering with Python

Accounting for the other CRUD operations

Up to this point, we've only accounted for two of the CRUD operations that all of our data objects need: create and read. The delete operations, across the board, are accounted for, but not yet proven; however, since that process is very simple, it can wait until we unit test everything, to prove that everything works. The missing item, then, is the update operation, at least in part. The various object documents that have been written to the database with every save() call have shown that the process of writing object data is working, but we haven't actually tried to update anything yet; and, if we were to try now, it would fail (and fail silently). The reason behind that failure is very simple, and ...