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3lvis/gist:fca1fa6449f554ed6ff33c0e00b136b7

Last active May 16, 2016 20:26
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gistfile1.txt
let remoteItems = localPrimaryKey
let localRelationship = self.valueForKey(relationship.name)
let localItems = localRelationship?.valueForKey(entity.sync_localPrimaryKey()) as? NSArray ?? NSArray()
let intersection = NSMutableSet(array: remoteItems as [AnyObject])
intersection.intersectSet(Set(arrayLiteral: localItems))
let updatedItems = intersection.allObjects
let deletedItems = localItems.mutableCopy()
deletedItems.removeObjectsInArray(remoteItems as [AnyObject])
let insertedItems = remoteItems.mutableCopy()
insertedItems.removeObjectsInArray(localItems as [AnyObject])
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