updateOrders

gistfile1.txt

func updateOrders(_ updates : [(objectID: NSManagedObjectID, order: Int64)]) {
    if updates.isEmpty {
        return
    }

    let coreDataStack = CoreDataStack.INSTANCE
    let backgroundContext = coreDataStack.backgroundContext

    backgroundContext.perform {
        var objectIDs: [NSManagedObjectID] = []

        do {
            for update in updates {
                let batchUpdateRequest = NSBatchUpdateRequest(entityName: "NSTabInfo")
                batchUpdateRequest.predicate = NSPredicate(format: "self == %@", update.objectID)
                batchUpdateRequest.propertiesToUpdate = ["order": update.order]
                batchUpdateRequest.resultType = .updatedObjectIDsResultType

                let batchUpdateResult = try backgroundContext.execute(batchUpdateRequest) as? NSBatchUpdateResult

                guard let batchUpdateResult = batchUpdateResult else { continue }
                guard let managedObjectIDs = batchUpdateResult.result else { continue }

                if let nsManagedObjectIDs = managedObjectIDs as? [NSManagedObjectID] {
                    objectIDs.append(contentsOf: nsManagedObjectIDs)
                }
            }

            if !objectIDs.isEmpty {
                let changes = [NSUpdatedObjectsKey : objectIDs]
                coreDataStack.mergeChanges(changes)
            }
        } catch {
            backgroundContext.rollback()

            error_log(error)
        }
    }
}