re: Core Data: is fetching safe
during validateForInsert:/validateForUpdate?

Is it OK to perform a fetch during validateForInsert:/
validateForUpdate:? I have a Core Data entity named 'Person' with an
attribute named 'uniqueNumber'. I want to ensure that no two People
have the same uniqueNumber.

It's not a great idea during validateForDelete: It fine during validateForInsert or validateForUpdate so long as the awakeFromFetch delegates and any other side effects (changes on the MOC or dirtying MOs) of fetching eventually reach a quiescent state. The canonical example of failing to do so is to update a timestamp in -willSave to the current time. Blindly. Without checking if it's already set, or equal. We'll save when the current time stops changing ...

- Ben


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