特定のIDのコアデータキーの値を編集

Question

私はidとdetailTextで作られたコアデータエンティティを持っています。アイデアは、私のテキストフィールドは、私のケースではタイムスタンプである特定のIDと一緒にコンテンツを格納しているということです。ユーザーがdetailTextを最初に保存したときには、これが正常に機能しますが、ユーザーが特定のIDのdetailTextを編集した場合、古いdetailTextを削除して新しいdetailTextを挿入します。 基本的に私は以下の質問をSwift/Coreデータに書くのに助けが必要です。

UPDATE myEntity SET detailText = theNewDetailText WHERE ID = myID; 

これらは私が私のIDを選択見つけるために述語を使用しますが、私は特定のIDのために対応するdetailTextフィールドを更新悩みを抱えている、私の現在の保存と交換する機能です。

func saveTextFromTextFieldToCoreData(textToSave: String){ 

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
    let managedContext = appDelegate.managedObjectContext 

    let entityDescription = NSEntityDescription.entityForName("GoalDetail", inManagedObjectContext:managedContext) 

    let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext) 


    print("received text to store and it's \(textToSave)") 

    if entityIsEmpty("GoalDetail") == true { 
     thingToSaveToCD.setValue(data.timeStamp, forKey: "id") 
     thingToSaveToCD.setValue(textToSave, forKey: "detailText") 
     print("succesfully saved \(data.timeStamp) and \(textToSave)") 

    } else { 

     replaceTheValueFromCoreData() 

    } 
} 

func replaceTheValueFromCoreData(){ 

    print("i have entered the delete core data item") 
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
    let managedContext = appDelegate.managedObjectContext 

    let fetchRequest = NSFetchRequest(entityName: "GoalDetail") 
    let predicate = NSPredicate(format: "id == %@", data.timeStamp) 
    fetchRequest.predicate = predicate 

    //let entityDescription = NSEntityDescription.entityForName("GoalDetail", inManagedObjectContext:managedContext) 

    //let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext) 

    do{ 
     let goal = try appDelegate.managedObjectContext.executeFetchRequest(fetchRequest) 

     try managedContext.save() 
    } 

    catch{ 
     //error 
    } 

私はGoogleと、スタックオーバーフローを進めてきたが、これまで任意のヘルプは大歓迎ですので、これを実行するために管理していません。

Answer 1

私は解決してきたこと

 func saveTextFromTextFieldToCoreData(textToSave: String){ 

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
    let managedContext = appDelegate.managedObjectContext 

    let entityDescription = NSEntityDescription.entityForName("GoalDetail", inManagedObjectContext:managedContext) 

    let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext) 

    //clumsy named entity is empty returns if there is already 
    // an ID/data.timeStamp in that entity so that I can 
    // either save or replace the data 
    print("received text to store and it's \(textToSave)") 

    if entityIsEmpty("GoalDetail") == true { 
     thingToSaveToCD.setValue(data.timeStamp, forKey: "id") 
     thingToSaveToCD.setValue(textToSave, forKey: "detailText") 
     print("succesfully saved \(data.timeStamp) and \(textToSave)") 

    } else { 
     replaceTheValueFromCoreData() 
     print("ovo tribq prominiti") 

    } 

} 



func replaceTheValueFromCoreData(){ 

    print("i have entered the delete core data item") 
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
    let managedContext = appDelegate.managedObjectContext 

    let fetchRequest = NSFetchRequest(entityName: "GoalDetail") 
    let predicate = NSPredicate(format: "id == %@", self.data.timeStamp) 
    fetchRequest.predicate = predicate 

    do { 
    if let fetchResults = try appDelegate.managedObjectContext.executeFetchRequest(fetchRequest) as? [NSManagedObject] { 
     if fetchResults.count != 0{ 

      var managedObject = fetchResults[0] 
      managedObject.setValue(self.trextViewForGoal.text, forKey: "detailText") 

      try managedContext.save() 
     } 
     }} 

     catch let error as NSError { 
      // failure 
      print("Fetch failed: \(error.localizedDescription)") 
     } 
}