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Not too sure if this is the right way of doing this, or if anyone has even tried, but be sure to check the registeredObjects NSArray of the NSManagedContext prior to fetching stuff. This of course only applies to SQLite backed stores, and this is done to reduce SQLite queries and inevitably disk I/O.
You can effectively query the registeredObjects using almost the same predicate as your subclassed NSManagedObjects in order to ensure that the NSManagedObject you want is the same.