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| extension NSManagedObject{ | |
| static func createItem(moc: NSManagedObjectContext, entityName: String) -> NSManagedObject { | |
| return NSEntityDescription.insertNewObjectForEntityForName( entityName, inManagedObjectContext: moc) | |
| } | |
| static func getListOfItems(moc: NSManagedObjectContext, entityName: String) -> [NSManagedObject]? { | |
| let fetchRequest = NSFetchRequest(entityName: entityName) | |
| do { | |
| let results = try moc.executeFetchRequest(fetchRequest) | |
| return results as? [NSManagedObject] | |
| } catch let error as NSError { | |
| print("Could not fetch \(error), \(error.userInfo)") | |
| return nil | |
| } | |
| } | |
| static func getItemsWhere(moc: NSManagedObjectContext, entityName: String, fieldsAndValues: [(String, String)]) -> [NSManagedObject]? { | |
| let fetchRequest = NSFetchRequest(entityName: entityName) | |
| let predicates = fieldsAndValues.map { (fieldAndValue:(String, String))-> NSPredicate in | |
| return NSPredicate(format:"\(fieldAndValue.0)==%@", fieldAndValue.1) | |
| } | |
| fetchRequest.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: predicates) | |
| do { | |
| let results = try moc.executeFetchRequest(fetchRequest) | |
| return results as? [NSManagedObject] | |
| } catch let error as NSError { | |
| print("Could not fetch \(error), \(error.userInfo)") | |
| return nil | |
| } | |
| } | |
| static func getItem(moc: NSManagedObjectContext, entityName: String, keyField: String, value: String) -> NSManagedObject? { | |
| let fetchRequest = NSFetchRequest(entityName: entityName) | |
| fetchRequest.predicate = NSPredicate(format:"\(keyField)==%@", value) | |
| do { | |
| let results = try moc.executeFetchRequest(fetchRequest) | |
| if results.count == 0 { | |
| print("There are no item with this value") | |
| } else if results.count > 1 { | |
| print("There is more than one item with this value") | |
| } else { | |
| return results[0] as? NSManagedObject | |
| } | |
| return nil | |
| } catch let error as NSError { | |
| print("Could not fetch \(error), \(error.userInfo)") | |
| return nil | |
| } | |
| } | |
| } |
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