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From the docs:
If you make changes to managed objects
associated with a given context, those
changes remain local to that context
until you commit the changes by
sending the context a save: message.
At that point—provided that there are
no validation errors—the changes are
committed to the store.
So does that essentially mean, that validation happens automatically as soon as I call -save?
Yes, validation is performed by the managed object context on save. You can manually validate an instance at any time by sending it a
-validateFor[Insert|Update|Delete]:, depending on the action that will occur on context save.