在swift中尝试更新领域对象时获取SIGABRT

Question

警告:我是iOS、Swift和Realm的新手。我保存和检索Realm没有问题，但我似乎无法在不崩溃的情况下更新现有对象。

AppDelegate:

class Bale: Object {
    dynamic var uid = NSUUID().UUIDString
    dynamic var id = 0
    dynamic var number = 0
    dynamic var type = 0
    dynamic var weight = 0
    dynamic var size = ""
    dynamic var notes = ""
    override static func primaryKey() -> String? {
        return "uid"
    }
}

别处:(xcode坚持所有的!)

    let bale: Bale = getBaleByIndex(baleSelected)
    bale.id = Int(textID.text!)!
    bale.number = Int(textNumber.text!)!
    bale.type = Int(textType.text!)!
    bale.weight = Int(textWeight.text!)!
    bale.size = textSize.text!
    bale.notes = textNotes.text!
    try! realm.write {
        realm.add(bale, update: true)
    }

getBaleByIndex:

func getBaleByIndex(index: Int) -> Bale {
    return bales[index]
}

我从getBaleByIndex在其他地方返回的Bale对象中读取数据，因此该函数工作正常。我得到SIGABRT在类AppDelegate: UIResponder, UIApplicationDelegate {。在领域文档或示例中没有显示更新的完整示例。我也尝试过使用realm。创建和适当的参数，但仍然没有去。看起来很简单，所以我肯定我在做蠢事。任何帮助都太好了。谢谢!

Answer 1

让您恼火的是，一旦向Realm添加了对象，数据就不仅仅存储在内存中，而是直接存储在持久存储中。您必须在写事务中对对象进行所有修改，这些修改将在写事务提交后自动生效。如果之前已将其持久化，则无需再次将其添加到Realm。因此，您需要将代码更改为如下内容:

try! realm.write {
    let bale: Bale = getBaleByIndex(baleSelected)
    bale.id = Int(textID.text!)!
    bale.number = Int(textNumber.text!)!
    bale.type = Int(textType.text!)!
    bale.weight = Int(textWeight.text!)!
    bale.size = textSize.text!
    bale.notes = textNotes.text!
    // Not needed, but depends on the implementation of `getBaleByIndex`
    // and whether there is the guarantee that it always returns already
    // persisted objects.
    //realm.add(bale, update: true)
}