[ZODB-Dev] Undo in run-time

[Jeremy Hylton]

>>>>> "ML" == Magnus Lycka <magnus@thinkware.se> writes:

  ML> But what happens with persistent objects that are referenced by
  ML> our program if they have changed or even become non-existent due
  ML> to the rewinding of the database?

At the next transaction boundary (abort / commit / connection.sync),
all the modified objects will be updated with their new state.  Any
attempt to commit a transaction with the current object state will
result in a ConflictError.

I'm not actually sure what will happen if you undo an object's
creation.  It would be easy to create a small test to see, but I don't
have time to do that today.

Jeremy