使用 AlamofireObjectMapper 将对象 json 数据映射到 2 个单独的数组中

Posted 2023-02-24

【中文标题】使用 AlamofireObjectMapper 将对象 json 数据映射到 2 个单独的数组中

【英文标题】：Mapping object json data into 2 separate arrays with AlamofireObjectMapper

【发布时间】：2017-12-21 08:02:50

【问题描述】：

我目前正在尝试实现到我的模型的映射，而我目前的做法并没有产生任何结果。我有一个 MediaLibrary 类，它包含 2 个数组，“exerciseMedia”和“stretchMedia”，它们都包含一个“媒体”对象数组。我选择了 ObjectMapper/AlamofireObjectMapper 库来将数据映射到我的模型。

import ObjectMapper

class MediaLibrary: Mappable 

    var exerciseMedia: [Media]?
    var stretchMedia: [Media]?

    required init?(map: Map) 
        mapping(map: map)
    

    func mapping(map: Map) 
        exerciseMedia <- map["ExerciseMedia"]
        stretchMedia  <- map["StretchMedia"]
    

这里是 Media 对象，它将构成填充我在 MediaLibrary 类中的两个数组的对象。

import ObjectMapper

struct Media: Mappable 

    var _id: String?
    var name: String?
    var desc: String?
    var imageURI: String?
    var videoURI: String?
    var trainerID: String?
    var isShoulders : Bool?
    var isNeck : Bool?
    var isLegs : Bool?
    var isHands : Bool?
    var isChest : Bool?
    var isCalves : Bool?
    var isButt : Bool?
    var isBack : Bool?
    var isArms : Bool?
    var isCore : Bool?
    var isFullBody : Bool?
    var isLowerBody : Bool?
    var isUpperBody : Bool?
    var isExercise : Bool?
    var isStretch : Bool?
    var equipmentNeeded : String?

    init?(map: Map) 

    mutating func mapping(map: Map) 

        _id             <- map["_id"]
        name            <- map["name"]
        desc            <- map["desc"]
        imageURI        <- map["imageURI"]
        videoURI        <- map["videoURI"]
        trainerID       <- map["trainerID"]
        isShoulders     <- map["isShoulders"]
        isNeck          <- map["isNeck"]
        isLegs          <- map["isLegs"]
        isHands         <- map["isHands"]
        isChest         <- map["isChest"]
        isCalves        <- map["isCalves"]
        isButt          <- map["isButt"]
        isBack          <- map["isBack"]
        isArms          <- map["isArms"]
        isCore          <- map["isCore"]
        isFullBody      <- map["isFullBody"]
        isLowerBody     <- map["isLowerBody"]
        isUpperBody     <- map["isUpperBody"]
        isExercise      <- map["isExercise"]
        isStretch       <- map["isStretch"]
        equipmentNeeded <- map["equipmentNeeded"]
    

现在这是我要映射的 json 示例。请注意，我的模型同时具有“imageURI”和“videoURI”，因为有 2 种类型的媒体对象，但由于它们是可选的，因此可以解释这一点。

    "StretchMedia": [
        
            "_id": "5a380db7ee292409b4f44980",
            "name": "somephoto",
            "desc": "some description",
            "imageURI": "https://videofitapptestbucket.s3.us-west-2.amazonaws.com/100006166323",
            "trainerID": "5a32f62a28ce4acbc5fbbb4b",
            "__v": 0,
            "createdAt": "2017-12-18T18:49:27.009Z",
            "isShoulders": false,
            "isNeck": false,
            "isLegs": false,
            "isHands": false,
            "isChest": false,
            "isCalves": false,
            "isButt": false,
            "isBack": false,
            "isArms": false,
            "isCore": false,
            "isFullBody": false,
            "isLowerBody": false,
            "isUpperBody": false,
            "isExercise": false,
            "isStretch": true,
            "equipmentNeeded": "none"
        ,
        
            "_id": "5a380dfa089b2d09dcfa92db",
            "name": "somephoto",
            "desc": "some description",
            "videoURI": "https://videofitapptestbucket.s3.us-west-2.amazonaws.com/100002098677",
            "trainerID": "5a32f62a28ce4acbc5fbbb4b",
            "__v": 0,
            "createdAt": "2017-12-18T18:50:34.277Z",
            "isShoulders": false,
            "isNeck": false,
            "isLegs": false,
            "isHands": false,
            "isChest": false,
            "isCalves": false,
            "isButt": false,
            "isBack": false,
            "isArms": false,
            "isCore": false,
            "isFullBody": false,
            "isLowerBody": false,
            "isUpperBody": false,
            "isExercise": false,
            "isStretch": true,
            "equipmentNeeded": "none"
        
    ],
    "ExerciseMedia": [
        
            "_id": "5a345a356ec5fc0032651611",
            "name": "Juan",
            "desc": "pic of some Spanish guy",
            "imageURI": "https://videofitapptestbucket.s3.us-west-2.amazonaws.com/10000998839",
            "trainerID": "5a32f62a28ce4acbc5fbbb4b",
            "isStretchCore": false,
            "isExerciseCore": false,
            "__v": 0,
            "createdAt": "2017-12-15T23:26:45.461Z",
            "isShoulders": false,
            "isNeck": false,
            "isLegs": false,
            "isHands": false,
            "isChest": false,
            "isCalves": false,
            "isButt": false,
            "isBack": false,
            "isArms": false,
            "isCore": false,
            "isFullBody": true,
            "isLowerBody": false,
            "isUpperBody": false,
            "isExercise": true,
            "isStretch": false,
            "equipmentNeeded": "Dumbbells"
        
    ],

我遇到的问题是如何在我的 MediaLibrary 类中将“ExerciseMedia”和“StretchMedia”的内容填充到它们各自的数组中。我创建了一个函数，该函数向包含您刚刚看到的 JSON 的路由发出请求（正文只需要培训师 ID）。到目前为止，我会发布我的代码。

import AlamofireObjectMapper

var mediaLibrary: MediaLibrary?

func setTrainerMediaLibrary(trainerID: String) 
        let body: [String: Any] = [
            "trainerID": trainerID
        ]

        Alamofire.request(TRAINER_MEDIA_ALL, method: .post, parameters: body, encoding: JSONEncoding.default, headers: HEADER).responseObject  (response: DataResponse<MediaLibrary>) in
            if response.result.error == nil 
                self.mediaLibrary = Mapper<MediaLibrary>().map(JSONObject: response.result.value)
             else 
                print("Could not map JSON data to Media Library model")
                debugPrint(response.result.error as Any)
            
        
    

MediaLibrary 对象返回 nil，所以有些地方不对劲。我的想法是，由于 MediaLibrary 具有“ExerciseMedia”和“StretchMedia”的映射，我需要做的就是在请求中使用 MediaLibrary，映射函数将自动处理您在 JSON 中看到的 2 个媒体键。我可能完全错了，但我知道我很接近，任何帮助将不胜感激。

【参考方案1】：

至于AlamofireObjectMapper的用法，对象响应已经映射到json了。您只需调用 .value 即可使用。

self.mediaLibrary = response.result.value

Mapper<MediaLibrary>().map() 的用法是指 ObjectMapper 库本身。

【讨论】：

谢谢！这很简单，但很有帮助