I need to merge nested json to simple json in dart flutter - json

Question

I need to merge nested json to simple json here is the response from API
{
"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"
}
]
}
How i need is
[
{
"id": 4,
"name": null
},
{
"id": 6,
"name": null
},
{
"id": 8,
"name": null
},
{
"id": 9,
"name": null
},
{
"id": 5,
"name": null
},
{
"id": 7,
"name": null
}
]
Here is my model
class HomeBannerModel {
int id;
String name;
HomeBannerModel({this.id, this.name});
HomeBannerModel.fromJson(Map<String, dynamic> json) {
id = json['id'];
image = 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;
}
}
SO here is my looping part
var responseList = response.data['data'];
if (response.data['success'] == true) {
List data = [];
responseList.forEach((k, v) {
var value =
v.map((banner) => HomeBannerModel.fromJson(banner)).toList();
data.add(value);
});
print(data);
but i am getting error as 'length' was called on null. so let me know where i am missing since i amnew to dart the api is giving numeric as key so i am facing the difficulty in getting the data

Answer 1

Maybe you can try this
List<HomeBannerModel> data = [];
responseList.forEach((key, value) {
value.forEach((element) {
data.add(HomeBannerModel.fromJson(element));
});
});