Flutter how to use where method in dynamic array-CodePudding

I want to use where method in dynamic array. I am getting data from api and i want to find some data from the response with the help of where method.

Following are the repsonse of api.

[
    {
      'status': true,
      'result': 'found',
      'data': [
        {
          'id': 10676487174744,
          'name': 'Taki Rajani',
          'email': '[email protected]',
          'isAdmin': false,
          'description': 'ta rai'
        },
        {
          'id': 1172269813061229,
          'name': 'Aar Raj',
          'email': '[email protected]',
          'isAdmin': false,
          'description': 'test'
        },
        {
          'id': 12854121,
          'name': 'testing',
          'email': '[email protected]',
          'isAdmin': false,
          'description': 'details'
        }
      ]
    }
  ]

following are my code for finding same user id which i was stored in storeUserID variable.

2 problems:- 1)when i print listof user, I am getting all datas in my case 3 data but when I print length of this list the reponse shows count only 1. 2)"where" method is showing nothing on print might be is not working.

Future<GetUserData> getUserDetail() async {
    var url = "https://aeliya.mydomin.com/getUser.php";
    var response = await http.get(Uri.parse(url));
    var jsondata = jsonDecode(response.body.toString());
    List listOfUser = [];

    if (response.statusCode == 200) {
      //print(jsondata);
      listOfUser.add(jsondata);
      print(listOfUser);
      print(listOfUser.length);
      var findid = listOfUser.where((element) => element == storeUserID);
      print(findid);
      return GetUserData.fromJson(jsondata);
    } else {
      return GetUserData.fromJson(jsondata);
    }

CodePudding user response：

Your api response contain a list and inside that the data contains the list you want. So change this:

if (response.statusCode == 200) {
  //print(jsondata);
  listOfUser.add(jsondata);
  print(listOfUser);
  print(listOfUser.length);
  var findid = listOfUser.where((element) => element == storeUserID);
  print(findid);
  return GetUserData.fromJson(jsondata);
} else {
  return GetUserData.fromJson(jsondata);
}

to this:

if (response.statusCode == 200) {
  
  print(jsondata[0]['data']);
  print(jsondata[0]['data'].length);
  var findid = (jsondata[0]['data'] as List)
    .where((element) => element['id'] == 1172269813061229);
  print(findid);
  return GetUserData.fromJson(jsondata[0]['data']);
} else {
  return GetUserData.fromJson(jsondata[0]['data']);
}

CodePudding user response：

when I print length of this list the reponse shows count only 1

its because here listOfUser.add(jsondata); you are adding the whole response body. and your response body is 1 object.

"where" method is showing nothing on print might be is not working.

you list is not a User list, thats why this condition element == storeUserID in your where method will always false. And if its false, then it will return nothing.

workaround:

...
var jsondata = jsonDecode(response.body); // do not make it to String. Your response is a LIST
List listOfUser = [];
 if (response.statusCode == 200) {
   // i assume your response will only have 1 object
   final data = jsondata[0]['data'];
   listOfUser.add(data);
   final findid  = listOfUser.where((element) => element['id'] == storeUserID);
   print(findid);
  return GetUserData();
  // return GetUserData.fromJson(jsondata); you have to make sure this is not error. its because your response is an array. not a Map
 }else{

 throw Exception(response.body);
 }
...