ios - Realm -iOS : Object reference set to nil after save

Question

我有 2 个类:Company 和 Employee。两者都继承了 Realm Object 类。

class Company:Object {
    var name:String = ""
    var employee:Employee?

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

class Employee:Object {
   var name:String = ""
   var age:Int = 0

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

填充对象

    var emp = Employee()
    emp.name = "Sachin"
    emp.age = 35

    var comp = Company()
    comp.name = "BCCI"

    comp.employee = emp

    println("Before: \(comp.employee)")

    var realm = Realm()
    realm.write {
        println("Before Add: \(comp.employee)")
        realm.add(comp, update: true)
        println("In Block: \(comp.employee)")
    }

    println("After: \(comp.employee)")

结果:

Before: Employee { name = Sachin; age = 35; }
Before Add: Employee { name = Sachin; age = 35; }
In Block: nil
After: nil

问题:为什么realm.add()操作后Company对象的employee属性为nil？有什么想法吗？

Answer 1

对于所有 Realm Swift 属性(List 除外)，您需要将属性声明为dynamic。将您的模型定义更改为以下内容应该会有所帮助!

class Company:Object {
    dynamic var name:String = ""
    dynamic var employee:Employee?

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

class Employee:Object {
   dynamic var name:String = ""
   dynamic var age:Int = 0

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