Question

我尝试更新两次值，我得到运行时错误。我的代码正在关注

我的模特是

class Achievement: Object {

   dynamic var name:String = ""
   dynamic var counter:Int = 0
   dynamic var happened:Bool = false

   convenience init(name:String, counter:Int, happened:Bool) {
    self.init()
    self.name = name
    self.counter = counter
    self.happened = happened
   }

   override class func primaryKey() -> String {
    return "name"
   }
}

功能

func checkHelperNerdAch() {

    var helperNerd = Achievement()

    let realm = try! Realm()

    var results = realm.objects(Achievement).filter("name = 'helperHelperNerd'")

    for element in results {

        helperNerd = Achievement(name: element.name, counter: element.counter, happened: element.happened)

    }

    helperNerd.counter++

    try! realm.write {
        realm.add(helperNerd, update: true)
    }



   if helperNerd.counter == 8 {

        let realm = try! Realm()
        print("entering if 8")
        helperNerd.happened = false
        try! realm.write {
            realm.add(helperNerd, update: true)
        }
        print("updated inside if 8")

   }

}

打印entering if 8

后应用程序崩溃

错误是

2015-12-30 15：09：00.307 AppName [3215：640021] *由于未捕获的异常终止应用程序＆＃39; RLMException＆＃39;，原因：＆＃39;尝试修改对象之外的对象写事务 - 首先在RLMRealm实例上调用beginWriteTransaction。＆＃39; * 第一次抛出调用堆栈：（0x2516c10b 0x24912e17 0xf6bf0b 0x1586c8 0x6cb5c 0x6cd38 0x29556043 0x29545ac3 0x26450c7f 0x26450f71 0x2512f68f 0x2512f27d 0x2512d5eb 0x25080bf9 0x250809e5 0x262ccac9 0x29310ba1 0x6db90 0x24d2f873） libc ++ abi.dylib：以NSException类型的未捕获异常终止

我做错了什么？

Answer 1

在第一次write阻止之后，您的helperNerd对象被添加到领域，因此它不再是独立对象。

存储对象的任何更新都应该在事务内部发生，但是您要在helperNerd.happened = false块之外分配write，因此会发生异常。

所以只需重写if块，如下所示：

if helperNerd.counter == 8 {
    let realm = try! Realm()
    print("entering if 8")
    try! realm.write {
        helperNerd.happened = false
        // note that add() is not needed anymore
        // because we're sure object exists in realm
    }
    print("updated inside if 8")
}

领域 - 无法更新值2次

1 个答案: