Loop through JSON response from Alamofire

Question

I am using xcode 7.2 and swift 2.1.1. using Alamofire for server communication. I have a tableview that display's dynamic data.Data includes username , useremail , profilePicture etc. I Tried to implement this code from stackoverflow. But I am getting a warning message says Cast from 'JSON' to unrelated type '[Dictionary]' always fails My json response is

{
  "JsonRequestBehavior" : 1,
  "MaxJsonLength" : null,
  "ContentType" : null,
  "Data" : {
    "_id" : "5658444778a7531f4c79c23d",
    "Photo" : "",
    "AllowSharing" : "YES",
    "MemberCount" : 5,
    "Users" : [
      {
        "_id" : "5658443478a7531f4c79c23c",
        "Photo" : "",
        "MembershipDate" : "0001-01-01T00:00:00",
        "MiddleName" : null,
        "FirstName" : "Gohan",
        "LastName" : null,
        "Email" : "gohan@gmail.com"
      },
      {
        "_id" : "566ea5f1dfead62350cf0fad",
        "Photo" : "",
        "MembershipDate" : "0001-01-01T00:00:00",
        "MiddleName" : null,
        "FirstName" : null,
        "LastName" : null,
        "Email" : "sachin@gmail.com"
      }
    ],
    "MembershipDate" : "2015-12-14T12:03:12.819Z",
    "CreatedBy" : "5658443478a7531f4c79c23c"
  },
  "ContentEncoding" : null,
  "RecursionLimit" : null
}

How can I loop through Users in JSON response ?

EDIT as per JohnyKutty's answer I tried the same code in my Project. The code for the same is

 Alamofire.request(.GET,App.AppHomeURL() + "Load_Group", parameters: ["groupid":"\(groupId)"]).responseJSON
            {
                response in
                 print("\(response.data)")
                switch response.result
                {

                case .Success(let _data):
                    let jsonData = JSON(_data)
                    print("Admin Response : \(jsonData)")

                do
                   {
                    let json = try NSJSONSerialization.JSONObjectWithData(_data as! NSData, options: .AllowFragments) as! NSDictionary
                        if let DataObject = json["Data"] as? NSDictionary
                        {
                            if let users = DataObject["Users"] as? [NSDictionary]
                            {
                                for user in users
                                {
                                    print("User id : \(user["_id"])")
                                }
                            }
                        }

                   }

                    catch let error as NSError
                    {
                        print(error.localizedDescription)
                    }

in this line let json = try NSJSONSerialization.JSONObjectWithData(_data as! NSData, options: .AllowFragments) as! NSDictionary At first I used "_data" and then Xcode suggested a change and it changed from _data to _data as! NSData.

Answer 1

Your son structure is like following JSON(Dictionary) -> Data(Dictionary) -> Users(Array of Dictionaries). So first you should pick the Users array from raw json then iterate through it.

Since alamofire is already serializing your response, No need to use JSONSerializer again, I am updating my answer.

UPDATE Try this code inside the case

if let DataObject = _data["Data"] as? NSDictionary {
    if let Users = DataObject["Users"] as? [NSDictionary] {
        for user in Users {
            print(user["_id"],user["MembershipDate"],user["FirstName"],user["Email"], separator: "   ", terminator: "\n")
        }
    }
}

Full code:

Alamofire.request(.GET,App.AppHomeURL() + "Load_Group", parameters: ["groupid":"\(groupId)"]) .responseJSON { response in
        switch response.result {

        case .Success(let _data):
            print(_data)
            if let DataObject = _data["Data"] as? NSDictionary {
                if let Users = DataObject["Users"] as? [NSDictionary] {
                    for user in Users {
                        print(user["_id"],user["MembershipDate"],user["FirstName"],user["Email"], separator: "   ", terminator: "\n")
                    }
                }
            }

        default:
            break;
        }


}