如何使用ObjectMapper为这个领域映射这个Json数组？

Question

如何使用ObjectMapper在RxSwift 3上映射以下Json数组？请帮我。无论如何，谢谢你。

class func getMessagesRequest(parameters: [String: Any]?, headers: [String:String] )  -> Observable<Any> {
    return request(.post,  kGetMsgHistory , parameters: parameters, encoding: JSONEncoding.default, headers: headers)
        .subscribeOn(MainScheduler.asyncInstance)
        .flatMap {response ->Observable<Any> in
            return response.validate(statusCode: 200..<300)
                .validate(contentType: ["application/json","text/json"])
                .rx.json()
        }

"messages" : 
[
    {
      "drTime" : 1478855430000,
      "messageId" : "59257",
      "options" : {
        "pushBidirectionalUrl" : null,
        "img" : "https:\/\/lh3.googleusercontent.com\/K272HPMCfs6k_zqvvt83pzowaIctVT6TO60kM561CWrOxGjePNZfiU-6H0Zj4YHHv9-f=w300-rw",
        "caption" : "Posters",
        "action" : "https:\/\/details.com?id=com.pomelogames.MarsGame"
      }
    },
    {
      "drTime" : 1478855440000,
      "messageId" : "59258",
      "options" : {
        "pushBidirectionalUrl" : null,
        "img" : "https:\/\/lh3.googleusercontent.com\/K272HPMCfs6k_zqvvt83pzowaIctVT6TO60kM561CWrOxGjePNZfiU-6H0Zj4YHHv9-f=w300-rw",
        "caption" : "Posters",
        "action" : "https:\/\/details.com?id=com.pomelogames.MarsGame"
      }
    },