arrays - 更新 NSManagedObjects 数组

Question

我正在使用 CoreData 和 swift 并尝试更新一组 NSManagedObjects。但是，当我尝试在上下文中更新记录中的两个键。我正在使用以下代码行来执行更新:"erManagedObject.setValue([(true, forKey: "aKey"),(false, forKey: "anotherKey")])"

public func updateRecordsForEntityManagedObject(_ entity: String, erManagedObject: [NSManagedObject]){
// Create the Fetch Request
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: entity)
let recordCount =  erManagedObject.count
     print(" Total Records: \(recordCount)")
     for i in 1...recordCount {
        // I receive the error here
        erManagedObject.setValue([(true, forKey: "aKey"),(DateUtilities().getTimestamp(), forKey: "timeStampKey")])
     }

非常感谢任何帮助!

Answer 1

替换

 for i in 1...recordCount {
    // I receive the error here
    erManagedObject.setValue([(true, forKey: "aKey"),(false, forKey: "anotherKey")])
 }

与

erManagedObject.forEach { 
   $0.setValue(true, forKey: "aKey")
   $0.setValue(false, forKey: "anotherKey")
}

因为你应该使用循环项来 setValue 而不是数组本身

---

 let request = NSFetchRequest<NSFetchRequestResult>(entityName:entity)

    do {
         let result = try context.fetch(request) as! [ModelName]
         result.forEach {
           $0.someKey = ""
         }
         // save context here  
     }
     catch {
       print(error)
    }