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I've been trying to get a column from a array into a list, I'm can't seem to figure how to do it, and I couldn't find a solution online. Most of the array i find only aren't nested.
{
"status": true,
"data": {
"1": [
{
"id": "1",
"name": "500MB [SME]",
"price": "220",
"telco_price": "0"
},
{
"id": "2",
"name": "1GB [SME]",
"price": "410",
"telco_price": "0"
},
{
"id": "3",
"name": "2GB [SME]",
"price": "800",
"telco_price": "0"
},
],
"2": [
{
"id": "AIR1000",
"name": "1.5GB ",
"price": "920",
"telco_price": "920"
},
{
"id": "AIR2000",
"name": "4.5GB",
"price": "1840",
"telco_price": "1840"
},
{
"id": "AIR2500",
"name": "6GB",
"price": "2300",
"telco_price": "2300"
}
],
"3": [
{
"id": "9MOB500",
"name": "500MB",
"price": "400",
"telco_price": "400"
},
{
"id": "9MOB1000",
"name": "1.5GB",
"price": "850",
"telco_price": "850"
},
{
"id": "9MOB2000",
"name": "2GB",
"price": "1020",
"telco_price": "1020"
},
]
}
}
firstly, i want to get all names into a list variable which i can then populate easily on one of my page...
i want it into var nameList = []; where its' stated "1" then the next into another variable like that
Do on fetch like
import 'package:http/http.dart' as http;
....
List<DataClass> nameList = [];
fetch() async {
final response = await http.get(Uri.parse(url));
if (response.statusCode == 200) {
final data = jsonDecode(response.body);
MyResponse myResponse = MyResponse.fromJson(data);
final values = myResponse.data?.values;
if (values != null) {
for (final v in values) {
if(v!=null) nameList.addAll(v.toList());
}
}
}
}
Try this model class
import 'dart:convert';
class MyResponse {
final bool? status;
final Map<String, List<DataClass>?>? data;
MyResponse({
this.status,
required this.data,
});
Map<String, dynamic> toMap() {
final result = <String, dynamic>{};
if(status != null){
result.addAll({'status': status});
}
if(data != null){
result.addAll({'data': data});
}
return result;
}
factory MyResponse.fromMap(Map<String, dynamic> map) {
return MyResponse(
status: map['status'],
data: Map<String, List<DataClass>?>.from(map['data']),
);
}
String toJson() => json.encode(toMap());
factory MyResponse.fromJson(String source) => MyResponse.fromMap(json.decode(source));
}
class DataClass {
final String? id;
final String? name;
final String? price;
final String? telco_price;
DataClass({
this.id,
this.name,
this.price,
this.telco_price,
});
Map<String, dynamic> toMap() {
final result = <String, dynamic>{};
if (id != null) {
result.addAll({'id': id});
}
if (name != null) {
result.addAll({'name': name});
}
if (price != null) {
result.addAll({'price': price});
}
if (telco_price != null) {
result.addAll({'telco_price': telco_price});
}
return result;
}
factory DataClass.fromMap(Map<String, dynamic> map) {
return DataClass(
id: map['id'],
name: map['name'],
price: map['price'],
telco_price: map['telco_price'],
);
}
String toJson() => json.encode(toMap());
factory DataClass.fromJson(String source) =>
DataClass.fromMap(json.decode(source));
}
I have list like this in provider:
List orders=[]:
void getOrders(){
orders = [
{"id":1,
"order":[
{"id":1,"name":"mike"},
{"id":2,"name":"john"},
{"id":3,"name":"smith"}
]
},
{"id":1,
"order":[
{"id":1,"name":"roz"},
{"id":2,"name":"sam"},
{"id":3,"name":"ruby"}
]
},
];
notifyListeners();
}
in provider when I use this methos to chane indexed order with another:
void changeOrder(orderIndex,item){
orders[orderIndex].update("order",(val)=>item);
notifyListeners();
}
I get this error type '(dynamic) => dynamic' is not a subtype of type '(Object) => Object' of 'update'
and when I use this :
void changeOrder(orderIndex,item){
orders[orderIndex]["order"]=item;
notifyListeners();
}
I get this error Unsupported operation: Cannot modify unmodifiable map
Add More Details
the item in changeOrder method comes from screen contain orders :
var item = List.from(orders[index]);
orders type is List<Map<String, dynamic>>. While reading the item, it will be a map instead of list.
Map item = Map.from(orders[index]);
And you can use both way you;ve tried.
List<Map<String, dynamic>> orders = [];
void getOrders() {
orders = [
{
"id": 1,
"order": [
{"id": 1, "name": "mike"},
{"id": 2, "name": "john"},
{"id": 3, "name": "smith"}
]
},
{
"id": 1,
"order": [
{"id": 1, "name": "roz"},
{"id": 2, "name": "sam"},
{"id": 3, "name": "ruby"}
]
},
];
}
void changeOrder(orderIndex, item) {
orders[orderIndex]["order"] = item;
// orders[orderIndex].update("order", (val) => item);
}
void main(List<String> args) {
getOrders();
print(orders);
Map item = Map.from(orders[1]);
changeOrder(1, item);
print(orders);
}
audio_service new update removed fromjson in model class .. how can i add media item from json? My json look like this
[
{
"id": "http://581.22.00.66:8500/1?type=http",
"title": "test",
"artist": "test",
"album": "test",
"artUri": "test.png",
"genre": "8535",
"displayDescription": "23"
},
{
"id": "http://581.22.00.66:6600/2?type=http",
"title": "test2",
"artist": "test2",
"album": "test2",
"artUri": "test2.png",
"genre": "1498",
"displayDescription": "23"
},
we using dio for json.
List<MediaItem> _queue = [];
void getdata() async {
final response = await Dio().get(Constants.url+'post.php', queryParameters: {
});
for (int i = 0; i < response.data.length; i++) {
_queue.add(response.data[i]);
}
}
Error:
Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'MediaItem'
If there is no default method to do that, you can create a JSON(map) parser function to audio_service's Media model.
Note: parser function converts only the fields that you provide on your json data.
MediaItem jsonToMeidaItem(Map data) {
return MediaItem(
id: data['id'].toString(),
title: data['title'].toString(),
artist: data['artist'].toString(),
album: data['album'].toString(),
artUri: data['artUri'].toString(),
genre: data['genre'].toString(),
displayDescription: data['displayDescription'].toString(),
);
}
Then you could be able to convert JSON data to MediaItem.
Substituted converter-function to your code:
List<MediaItem> _queue = [];
void getdata() async {
final response = await Dio().get(Constants.url+'post.php', queryParameters: {
});
for (int i = 0; i < response.data.length; i++) {
final MediaItem mediaItem = jsonToMeidaItem(response.data[i]);
_queue.add(mediaItem);
}
}
I am getting a response as key as numeric. How to map data for the following response
{
"1": [
{
"id": 6,
"name": "test 1"
},
{
"id": 8,
"name": "test 2"
},
{
"id": 7,
"name": "test 3"
}
],
"2": [
{
"id": 9,
"name": "ttt1"
},
{
"id": 5,
"name": "ttt3"
}
],
"3": [
{
"id": 4,
"name": "ttg",
"status_id": 1
}
]
}
Here is my model
import 'dart:convert';
Map<String, List<HomeBannerModel>> homeBannerModelFromJson(String str) => Map.from(json.decode(str)).map((k, v) => MapEntry<String, List<HomeBannerModel>>(k, List<HomeBannerModel>.from(v.map((x) => HomeBannerModel.fromJson(x)))));
String homeBannerModelToJson(Map<String, List<HomeBannerModel>> data) => json.encode(Map.from(data).map((k, v) => MapEntry<String, dynamic>(k, List<dynamic>.from(v.map((x) => x.toJson())))));
class HomeBannerModel {
int id;
String name;
HomeBannerModel({this.id, this.name});
HomeBannerModel.fromJson(Map<String, dynamic> json) {
id = json['id'];
name= json['name'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['id'] = this.id;
data['name'] = this.name;
return data;
}
}
I need to take the value in UI as
var data1 = data['1'];
var data2= data['2'];
var data3= data['3'];
but I am getting errors. help how to get the data of each key in each of the variable
but while mapping I am getting errors I have added part of my code in UI
_message:"type 'Map<String, dynamic>' is not a subtype of type 'List'"
The following method will convert your json string to a valid map object so that you can get your data the way you wanted.
Map<String, List<HomeBannerModel>> homeBannerModelFromJson(String str) => Map.from(json.decode(str)).map((k, v) => MapEntry<String, List<HomeBannerModel>>(k, List<HomeBannerModel>.from(v.map((x) => HomeBannerModel.fromJson(x)))));
to access data
final data = homeBannerModelFromJson(your_json_string);
print(data['1'][0].name); // test 1
You current json structure is Map<String, List<Map<String, dynamic>>>
You can try something like
var json = {...};
json.forEach((key, list) {
list.forEach((homeBannerModelMap) {
HomeBannerModel hBM = HomeBannerModel.fromJson(homeBannerModelMap);
});
});
You getting the error because your data is the type of Map, not the List.
So you can do something like this:
// [data] is result banners
List data = [];
// [result] is your object variable {"1": [{"id": 1, "name": "Welcome!"}]} etc
// So .forEach method is used for iterating through your json object
result.forEach((k, v){
// in which iteration I will map every instance to List of [HomeBannerModel]
var value = v.map((banner) => HomeBannerModel.fromJson(banner)).toList();
//in result I will add the result to our [banners] List
data.add(value);
});
But in this case, you should do:
data1 = data[1] // use int as the key, result will be List of BannerModels [Instance of 'HomeBannerModel', Instance of 'HomeBannerModel']
instead of:
var data1 = data['1']; //use string as the key
Please try the following code with just one model 'HomeBannerModel'.
main() {
final Map<String, dynamic> json = {
"1": [
{"id": 6, "name": "test 1"},
{"id": 8, "name": "test 2"},
{"id": 7, "name": "test 3"}
],
"2": [
{"id": 9, "name": "ttt1"},
{"id": 5, "name": "ttt3"}
],
"3": [
{"id": 4, "name": "ttg", "status_id": 1}
]
};
final Map datas = {};
json.forEach((key, value) {
datas.addAll(
{"$key": value.map((ele) => HomeBannerModel.fromMap(ele)).toList()});
});
print(datas["1"]);
print(datas["2"]);
print(datas["3"]);
}
class HomeBannerModel {
final int id;
final String name;
final int status_id;
HomeBannerModel({
this.id,
this.name,
this.status_id,
});
Map<String, dynamic> toMap() {
return {
'id': id,
'name': name,
'status_id': status_id,
};
}
factory HomeBannerModel.fromMap(map) {
if (map == null) return null;
return HomeBannerModel(
id: map['id'],
name: map['name'],
status_id: map['status_id'],
);
}
#override
String toString() => 'Details(id: $id, name: $name, status_id: $status_id)';
}
You may also try with two models (1) Data and (2) HomeBannerModel. Please see the following code :
main() {
final Map<String, dynamic> json = {
"1": [
{"id": 6, "name": "test 1"},
{"id": 8, "name": "test 2"},
{"id": 7, "name": "test 3"}
],
"2": [
{"id": 9, "name": "ttt1"},
{"id": 5, "name": "ttt3"}
],
"3": [
{"id": 4, "name": "ttg", "status_id": 1}
]
};
final List<Data> data = [];
json.forEach((key, value) {
data.add(Data.fromMap({"id": key, "details": value}));
});
print(data.firstWhere((e) => e.dataID == '1').homeBannerModel);
print(data.firstWhere((e) => e.dataID == '2').homeBannerModel);
print(data.firstWhere((e) => e.dataID == '3').homeBannerModel);
}
class Data {
final String dataID;
final List<HomeBannerModel> homeBannerModel;
Data({
this.dataID,
this.homeBannerModel,
});
factory Data.fromMap(Map<String, dynamic> map) {
if (map == null) return null;
return Data(
dataID: map["id"],
homeBannerModel: (map["details"]
.map<HomeBannerModel>((ele) => HomeBannerModel.fromMap(ele))
.toList() as List<HomeBannerModel>));
}
#override
String toString() => 'Data(id: $dataID, details: $homeBannerModel)';
}
class HomeBannerModel {
final int id;
final String name;
final int status_id;
HomeBannerModel({
this.id,
this.name,
this.status_id,
});
Map<String, dynamic> toMap() {
return {
'id': id,
'name': name,
'status_id': status_id,
};
}
factory HomeBannerModel.fromMap(map) {
if (map == null) return null;
return HomeBannerModel(
id: map['id'],
name: map['name'],
status_id: map['status_id'],
);
}
#override
String toString() => 'Details(id: $id, name: $name, status_id: $status_id)';
}
From what I’m seeing in the sample response you shared , the kets are all string as should be... "1" is also String FYI.
Coming to the error you're getting its because you are probably using the var data1,data2,data3 as a map which it isn't.
var data1 = data['1'];
if you print this var you will get :
[
{
"id": 6,
"name": "test 1"
},
{
"id": 8,
"name": "test 2"
},
{
"id": 7,
"name": "test 3"
}
]
If you want to access the submap with id of 6 and name Test 1 do the following:
print(data1[0]);
to display name:
print(data1[0]["name"]);
I have this item and want loop "description" and "id" objects into array list;
{
"code": 200,
"message": "OK",
"payload": {
"items": [
{
"description": "test",
"icon": "",
"id": 25
},
{
"description": "TEST PACKAGE",
"icon": "",
"id": 26
},
{
"description": "TEST PACKAGE 2",
"icon": "",
"id": 26
}
]
}
}
Model
Item(decription: "" , id: "" );
Create Item class.
class Item {
String description;
int id;
Item({this.description, this.id});
}
Define fromJson constructor for Item class
class Item {
String description;
int id;
Item({this.description, this.id});
Item.fromJson(Map<String, dynamic> json) {
description = json['description'];
id = json['id'];
}
}
final response = await http.get("YOUR API");
// Convert response String to Map
final responseJson = json.decode(response.body);
List<Item> items = List();
if (responseJson != null && responseJson["payload"] != null) {
Map payload = responseJson["payload"];
if (payload["items"] != null) {
// Convert each item from Map to Item object and add it to the items List
payload["items"].forEach(
(v) {
final item = Item.fromJson(v);
items.add(item);
},
);
}
}