Realm-iOS:保存后对象引用设置为nil [英] Realm-iOS: Object reference set to nil after save

问题描述

我有2个班级:公司和员工.两者都继承Realm Object 类.

I have 2 classes: Company and Employee. Both inherit the 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:

之前:员工{ 名称= Sachin； 年龄= 35; }
在添加之前:员工{ 名称= Sachin； 年龄= 35; }
区块中:nil
之后:无

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?

QUESTION: Why is the employee property of the Company object nil after the realm.add() operation? Any thoughts?

推荐答案

对于所有Realm Swift属性(List除外)，您需要将这些属性声明为dynamic.将模型定义更改为以下内容将有所帮助！

For all Realm Swift properties (except for List), you need to declare the properties as dynamic. Changing your model definitions to the following should help!

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"
   }
}

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