Realm-iOS：对象引用在保存后设置为 nil

Question

我有 2 个 class：公司和员工。两者都继承了 Realm Object class.

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： 为什么公司员工属性在realm.add()操作后对象为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"
   }
}

Realm-iOS：对象引用在保存后设置为 nil

Realm-iOS: Object reference set to nil after save

realm

ios