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Getting Information About Changed Objects

An EOEditingContext maintains information about three different kinds of changes to objects in its object graph: insertions, deletions, and updates. After changes have been made to enterprise objects in an editing context and before the changes are committed to the database, you can determine which objects have changed using the methods insertedObjects, deletedObjects, and updatedObjects. These methods return an array of the objects that have been inserted, deleted, and updated, respectively. Before invoking these methods, you should check to see if any of the objects in an editing context have changed by invoking the method hasChanges on the editing context.

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