The notification object is the managed object context. The userInfo
dictionary contains the following keys: NSInsertedObjectsKey, NSUpdatedObjectsKey, and NSDeletedObjectsKey.
You can only use the managed objects in this notification on the same thread on which it was posted.
You can pass the notification object to mergeChangesFromContextDidSaveNotification: on another thread, however you must not use the managed object in the user info dictionary directly on another thread. For more details, see Concurrency with Core Data.
A key that specifies that all objects in the context have been invalidated.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.