Concurrent Core Data, Now Easier Than Ever

Arkadiusz Holko:

Our main thread-bounded operations use viewContext. Background work can be performed on a context returned by the factory method newBackgroundContext(). However, usage of performBackgroundTask(_:) is recommended because of the under-the-hood optimizations.

All contexts are independent of each other, there are no parent/child relationships here. To receive changes from other contexts we simply set automaticallyMergesChangesFromParent flag to true on a context. Despite its name (*FromParent*), it works correctly with the NSPersistentContainer setup in which contexts are siblings:

Not sure I understand that last bit.

Update (2016-07-07): James O’Leary says that, despite the name of the property, it treats the persistent store itself as an implicit parent context.

Concurrency Core Data iOS iOS 10 Mac macOS 10.12 Sierra Programming

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