我遇到了一些错误,当我试图编译我的境界代码,这是代码的第一个版本:境界错误:RLMArray和迁移
import RealmSwift
class Test: Object {
dynamic var name = ""
dynamic var dict = Dictionary<String, Int>()
dynamic var owner: TestList?
}
class TestList: Object{
dynamic var name = ""
let tests = List<Test>().filter("ALL Test.dict[hello] != nil")
}
//ViewController
import RealmSwift
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let realm = Realm()
let test1 = Test()
test1.name = "test1"
test1.dict = ["hello": 1]
realm.write{realm.add(test1)}
let test2 = Test()
test2.name = "test2"
test2.dict = ["nihao": 2]
realm.write{realm.add(test2)}
let test3 = Test()
test3.name = "test3"
test3.dict = ["hello": 3]
realm.write{realm.add(test3)}
}
@IBOutlet weak var label: UILabel!
@IBAction func set(sender: UIButton){
let test = Test()
let realm = Realm()
test.name = "not using CoreData"
realm.write{realm.add(test)}
text = "abc"
}
@IBAction func show(sender: UIButton){
let test = Realm().objects(TestList)
var str = ""
println("got to here")
for i in test{
str += " \(i.name)"
}
label.text = str
}
}
在此设置下我得到一个错误我日志,上面写着: Terminating app due to uncaught exception 'RLMException', reason: 'This method can only be called on RLMArray instances retrieved from an RLMRealm'
当我删除了我的TestList对象的筛选,错误变成了:Terminating app due to uncaught exception 'RLMException', reason: 'Migration is required for object type 'Test' due to the following errors: - Property 'dict' has been added to latest object model. - Property 'owner' has been added to latest object model.'
难道我理解的领域的文档完全错了吗?
非常感谢您的详细解答!我能够解决几乎所有的错误,但我不完全理解最后一个错误的解决方法,似乎如果我不从一个新的Realm开始,每次调用它时查询结果都会建立起来。所以我最终每次运行程序时都会得到一组结果。 – Liumx31
是的,这是正确的。如果你没有从一个全新的Realm开始,那么你的查询结果在每次运行后都会包含一个结果,因为你在视图控制器的viewDidLoad方法中添加了对象。这些更改**持续**。毕竟,这就是你使用Realm的原因,对吧? ;) – marius