迅速不给嵌套模型赋值

Question

尝试为模型对象分配值，但返回nil

我的模特：

struct Request:Mappable{


    var  id:String="" //
    var  origin:Location? 

}
  mutating func mapping(map: Map) {


        id <- map["id"]//
        origin <- map["origin"] //

}


struct Location :Mappable{

    var address=Address()


    mutating func mapping(map: Map) {

        address <- map["address"]

    }


var request=Request()
request.origin?.address.province?.id = "test" // assign nil

Answer 1

假设您具有key1 = {key[0] for key in my_dictionary} 和Address类型，如下所示，

Province

然后为省struct Address { var province: Province? } struct Province { var id: String? } 分配一个值，您需要按如下所示设置id，

request