質問編集履歴

すみません、coredataの定義を追加しました。

2020/11/04 07:21

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@@ -348,6 +348,78 @@
 ```
+```
+import Foundation
+import CoreData
+extension Singer {
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<Singer> {
+        return NSFetchRequest<Singer>(entityName: "Singer")
+    }
+    @NSManaged public var firstName: String?
+    @NSManaged public var lastName: String?
+    var wrappedFirstName: String {
+        firstName ?? "Unknown"
+    }
+    var wrappedLastName: String {
+        lastName ?? "Unknown"
+    }
+}
+extension Singer : Identifiable {
+}
+```
+```
+import Foundation
+import CoreData
+@objc(Singer)
+public class Singer: NSManagedObject {
+}
+```
 ### 試したこと