json - 将 json 响应转换为 Realm 对象

Question

您好，我正在尝试将来自 Web 服务的 json 响应转换为 Realm 对象，并使用对象映射器将其插入 Realm 数据库，但返回的对象具有空值

Alamofire.request(url).responseJSON { response in
   let products = Mapper<ProRealm>().map(JSONObject:response.result.value)
        print("products",products) // object with null values
   }

我的 ProRealm 类是

class ProRealm: Object, Mappable {

dynamic var additives_count: String?
var rating: String?
var updated: Bool = false;
var name: String?
var barcode: String?
var product_key: String?
var hazard_count: String?
var state: String?
var no_of_users_rated: String?
var thumbnail: String?
var overall_rating : String?
var is_food_or_beverage : Bool = false

//Impl. of Mappable protocol
required convenience init?(map: Map) {
    self.init()
}

func mapping(map: Map) {
    additives_count    <- map["additives_count"]
    rating <- map["rating"]
    updated <- map["updated"]
    name <- map["name"]
    barcode <- map["barcode"]
    product_key <- map["product_key"]
    hazard_count    <- map["hazard_count"]
    state <- map["state"]
    no_of_users_rated <- map["no_of_users_rated"]
    thumbnail <- map["thumbnail"]
    overall_rating <- map["overall_rating"]
    is_food_or_beverage <- map["is_food_or_beverage"]
}
}

在 Json 响应中，产品位于产品键内。请建议如何将其转换为 Realm 对象

["kind": aWareInternalAPI#productsItem, "products":(
{
"additives_count" = 3;
barcode = 12345;
"hazard_count" = 0;
"is_food_or_beverage" = 1;
name = "Water Bottle";
"no_of_users_rated" = 1;
"overall_rating" = "0.0";
"product_key" = "ahdzfmF3YXJlLWJhY2tlbmQtc3RhZ2luZ3IlCxIEVXNlchiAgICgvoOTCQwLEgdQcm9kdWN0GICAgIDE_JAKDA";
rating = 0;
state = "OCR_PROCESSING";
thumbnail = "http://lh3.googleusercontent.com/dMxwgSQB02osZJJex4S57iupaMT9tjDYZaD7mweJUjYmI1KNEcZZe1syBwrRs1GbYdZNrRUtQwRYUwXiAEscGNYH-J9f3gJOXYO1rQ=s150";
updated = 1;
},
{
"additives_count" = 0;
barcode = 53647825898248485;
"hazard_count" = 0;
"is_food_or_beverage" = 1;
"no_of_users_rated" = 0;
"overall_rating" = "0.0";
"product_key" = ahdzfmF3YXJlLWJhY2tlbmQtc3RhZ2luZ3IlCxIEVXNlchiAgICgvoOTCQwLEgdQcm9kdWN0GICAgICumYAJDA;
rating = "";
state = "OCR_PROCESSING";
thumbnail = "http://lh3.googleusercontent.com/0D55ZXkG8Ua5ULDK69Po-IHeDPIfXZHOi7LlLURoc1qZzmNst57xUMQSPzWTW5miSDglc5wKDA4QlvLvnD6aMOqIHcwlj_HY-Hs=s150";
updated = 1;
})]

请多多指教

Answer 1

除了 updated 和 is_food_or_beverage 之外的所有属性都是 nilable，因此它们有可能是 nil。如果您知道它们应该有一个值，但您仍然得到 nil，请确保检查映射函数中的键。

更新:
我不是 100% 确定这如何与 Mappable 的语法一起工作，但你需要这样做:

class Products: Object, Mappable {
    let products: [Product]?

    //Impl. of Mappable protocol
    required convenience init?(map: Map) {
        self.init()
    }

    func mapping(map: Map) {
        products    <- map["products"]
    }
}

class Product: Object, Mappable {
    dynamic var additives_count: String?
    var rating: String?
    var updated: Bool = false;
    var name: String?
    var barcode: String?
    var product_key: String?
    var hazard_count: String?
    var state: String?
    var no_of_users_rated: String?
    var thumbnail: String?
    var overall_rating : String?
    var is_food_or_beverage : Bool = false

    //Impl. of Mappable protocol
    required convenience init?(map: Map) {
        self.init()
    }

    func mapping(map: Map) {
        additives_count    <- map["additives_count"]
        rating <- map["rating"]
        updated <- map["updated"]
        name <- map["name"]
        barcode <- map["barcode"]
        product_key <- map["product_key"]
        hazard_count    <- map["hazard_count"]
        state <- map["state"]
        no_of_users_rated <- map["no_of_users_rated"]
        thumbnail <- map["thumbnail"]
        overall_rating <- map["overall_rating"]
        is_food_or_beverage <- map["is_food_or_beverage"]
    }
}

因此创建两个不同的类，一个包含一组 product，另一个是 Product。