Created
September 16, 2015 03:17
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Strongly-typed Core Data ideas
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| import CoreData | |
| /// Designed to add functionality to classes deriving from *NSManagedObject* | |
| protocol Managed {} | |
| // This keeps us from having to explicitly implement Managed | |
| // on all NSManagedObject subclasses. | |
| extension NSManagedObject: Managed {} | |
| // Managed is extended instead of NSManagedObject, | |
| // so that we can work with derived types, and avoid casting externally. | |
| extension Managed where Self: NSManagedObject { | |
| static var newManagedObject: Self { | |
| return NSEntityDescription.insertNewObjectForEntityForName(className, | |
| inManagedObjectContext: CoreDataStack.managedObjectContext | |
| ) as! Self | |
| } | |
| static var storedInContext: [Self] { | |
| let fetchRequest = NSFetchRequest(entityName: className) | |
| fetchRequest.entity = NSEntityDescription.entityForName(className, | |
| inManagedObjectContext: CoreDataStack.managedObjectContext | |
| )! | |
| return try! CoreDataStack.managedObjectContext.executeFetchRequest(fetchRequest) | |
| as! [Self] | |
| } | |
| } | |
| // Keep this in another file. | |
| public extension NSObject { | |
| public static var className: String { | |
| return NSStringFromClass(self).componentsSeparatedByString(".").last! | |
| } | |
| } |
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