Swift Core Data NSPredicate靜態字符串問題

Question

我想使謂詞更靈活地進行更改。 我在源代碼中有很多這樣的字符串：

let predicate = NSPredicate(format: "bodyPart.name = %@", name)

let filteredExercises = ExerciseEntity.mr_findAll(with: predicate)

但是正如您看到的，例如，某天我是否將BodyPart名稱更改為MuscleGroup，它將導致以下問題：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath bodyPart.name not found in entity <NSSQLEntity ExerciseEntity id=5>'

我正在尋找具有以下關鍵路徑的解決方案

let predicate = NSPredicate(format: "%@ = %@", \BodyPart.name, name)

Answer 1

使用％K替代密鑰路徑

let predicate = NSPredicate(format: "%K = %@", #keyPath(BodyPart.name), name)