如何识别 JSON 响应中的特定值

Question

我想获得特定的 JSON 响应。例如，仅获取 id 为 25 和 26 的数组中的结果（即名称和分数）。swift 中是否有 WHERE 子句？如果有帮助，我正在使用 Alamofire 和 SwiftyJSON。

现在我的代码只是提取所有值，但我只想得到 id 为 25 和 26 的结果。这可能吗？

我的代码：

  Alamofire.request(.GET, endPoint).validate()
        .responseJSON { response in

  switch response.result {

  case .Success:
            if let value = response.result.value {
                let json = JSON(value)
                for (_,subJson):(String, JSON) in json {
                    if let date = subJson["start_date"].string{
                        self.date = date
                    }
                    if let building = subJson["building_name"].string{
                        self.building = building
                    }
                    if let jobId = subJson["schedule_job_id"].int {
                        self.jobIdArray.append(jobId)
                    }
                    if let tasks = subJson["tasks"].array{
                        for building in tasks {
                            Tasks.sharedInstance.datas = tasks
                            if let ratings = building["safety_ratings"].array{
                                for submission in ratings {
                                    if let score = submission["score"].string {
                                        self.scoreArray.append(score)
                                    }
                                    if let ratingId = submission["safety_rating_id"].int {
                                        self.ratingArray.append(ratingId)
                                    }
                                    if let submissionId = submission["submission_id"].int {
                                        self.subIdArray.append(submissionId)
                                    }
                                }
                            }
                        }
                    }
                }
                onCompletion()
            }
 case .Failure(let error):
        print("Request failed with error: \(error)")
        onError?(error)
    }
}  

更新

    func getTask(onCompletion: () -> (), onError: ((NSError) -> ())? = nil) {

    guard let endPoint = Data.sharedInstance.weeklyEndpoint  else { print("Empty endpoint"); return }

    Alamofire.request(.GET, endPoint, encoding: .JSON)
        .validate()
        .responseJSON { response in

        switch response.result {

        case .Success:
            if let value = response.result.value {
                let json = JSON(value)
                for (_,subJson):(String, JSON) in json {
                    if let date = subJson["start_date"].string{
                        self.date = date
                    }
                    if let building = subJson["building_name"].string{
                        self.building = building
                    }
                    if let jobId = subJson["schedule_job_id"].int {
                        self.ratingArray.append(jobId)
                    }

                    let IDsYouWant: [Int] = [18, 27]

                    let tasksYouWant = subJson["tasks"].arrayValue.filter {IDsYouWant.contains($0["id"].intValue)}

                    for task in tasksYouWant {

                        if let ratings = task["safety_ratings"].array{
                            for submission in ratings {

                                if let score = submission["score"].string {
                                    let scoreResult = Int(score)
                                    self.ratingArray.append(scoreResult!)
                                }

                                if let ratingId = submission["safety_rating_id"].int {
                                    self.ratingArray.append(ratingId)
                                }

                                if let submissionId = submission["submission_id"].int {
                                    self.ratingArray.append(submissionId)
                                }

                            }
                        }
                    }

                    if let tasks = subJson["tasks"].array{
                            Tasks.sharedInstance.datas = tasks
                    }
                }

                print(self.ratingArray)
                onCompletion()
            }

        case .Failure(let error):
            print("Request failed with error: \(error)")
            onError?(error)
        }
    }      
}

当我打印 taskYouWant 时，我得到一个空数组..

这是来自我的 GET https://codeshare.io/UqJMV 的 JSON 响应

我正在寻找的是score、safety_rating_id，其中我的submission_id 是x 值。比如拉取submission_id为27的数组。

Answer 1

如何将 subJson["tasks"] 转换为数组然后对其进行过滤：

let IDsYouWant: [Int] = [25, 26]
let tasksYouWant = subJson["tasks"].arrayValue.filter {IDsYouWant.contains($0["id"].intValue)}

for task in tasksYouWant {
    //process task 25 and 26
}

希望有帮助！