本文介绍了RLMException:迁移到Swift 4的对象'Book'上不存在'主键属性'serial'的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述我正在使用Swift 4编译在iOS上使用Realm遇到此问题，在启动时应用程序崩溃并显示以下消息I'm running into this issue with Realm on iOS using Swift 4 compilation, where on startup the app crashes with the following messageRLMException', reason: 'Primary key property 'serial' does not exist on object 'Book''
我看到了类似的错误消息，但不是相同的错误消息.
这就是我的对象的样子I saw similar error messages, but not the same one.
This is what my object looks likeimport Foundation
import RealmSwift
class Book: Object {
dynamic var serial: String = ""
dynamic var title: String = ""
dynamic var pages: Int = 0
dynamic var genre: String = ""
override static func primaryKey() -> String? {
return "serial"
}
}
当我通过Realm Browser应用程序检查default.realm文件时，我注意到条目中只有#(0,1,2)，并且其中没有数据.如果我注释掉主键，它将运行，但是在Realm中没有存储该对象.无法弄清楚为什么它崩溃了！When I checked the default.realm file through the Realm Browser app, I noticed that the entries only have a # (0,1,2) and no data in it.
If I comment out the primary key, it runs, but nothing is stored in Realm for this object. Can't figure out why it's crashing!推荐答案在Realm中，模型的属性必须具有@objc dynamic var属性，这就是我所缺少的.In Realm, the properties of your model have to have the @objc dynamic var attribute, that is what I was missing.来自领域网站:
领域模型属性必须具有@objc dynamic var属性，才能成为基础数据库数据的访问器.请注意，如果将该类声明为@objcMembers(Swift 4或更高版本)，则可以将各个属性声明为dynamic var.
Realm model properties must have the @objc dynamic var attribute to become accessors for the underlying database data. Note that if the class is declared as @objcMembers (Swift 4 or later), the individual properties can just be declared as dynamic var.这篇关于RLMException:迁移到Swift 4的对象'Book'上不存在'主键属性'serial'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！}