Parsing nested json list to model fails flutter - flutter

Question

I have search screen where i can serach text it will returns data like json below,but when i try to parse data it's not working i am getting data upto this line of codevar data = menu_list[i];,but when i pass data to model,it's not quite working,any idea what went wrong
Retrieve json from api function
Future<String> GetSearchdata(String search_text) async {
ProgressDialog dialog = CustomDialogs().showLoadingProgressDialog(context);
var response = await http.post(Urls.SEARCH_ALL,
headers: {"Content-Type": "application/json", "Authorization": token},
body: json.encode({"searchText": search_text, "language": "english"}));
Map<String, dynamic> value = json.decode(response.body);
var status = value['status'];
var msg_response = value['message'];
if (response.statusCode == 200) {
dialog.dismissProgressDialog(context);
if (status == true) {
var menu_list = value['doc'];
if(menu_list.length>0)
{
for (int i = 0; i < menu_list.length; i++) {
var data = menu_list[i];
_searchResult.add(SearchModel.fromJson(data));
}
setState(() {
print("UI Updated");
});
}
else{
final snackBar = SnackBar(content: Text("No data available"));
_scaffoldKey.currentState.showSnackBar(snackBar);
}
} else {
final snackBar = SnackBar(content: Text(msg_response));
_scaffoldKey.currentState.showSnackBar(snackBar);
}
} else {
final snackBar = SnackBar(content: Text(msg_response));
_scaffoldKey.currentState.showSnackBar(snackBar);
}
}
Model
class SearchModel {
String id = "";
String name = "";
String category_name = "";
SearchModel({
this.id,
this.name,
this.category_name,
});
SearchModel.fromJson(json)
: id = json['_id'].toString(),
name = json['registrations']['name'].toString(),
category_name =json['category']['name'].toString();
}
Json
{
"status":true,
"doc":{
"registrations":[
{
"_id":"5f44b5aafc77a977e88f558c",
"name":"test shop",
"category":[
{
"name":"/Furnitue Shop"
}
]
},
{
"_id":"5f44bd1b52977b4d1411f281",
"name":"test1",
"category":[
{
"name":"/Painting"
}
]
}
]
}
}

Answer 1

Try my code below :
Model
class SearchModel {
String id = "";
String name = "";
String category_name = "";
SearchModel({
this.id,
this.name,
this.category_name,
});
SearchModel.fromJson(json)
: id = json['_id'].toString(),
name = json['name'].toString(),
category_name = json['category'][0]['name'].toString();
}
Retrieve json
if (response.statusCode == 200) {
dialog.dismissProgressDialog(context);
if (status == true) {
var menu_list = value['doc']["registrations"];
if(menu_list.length>0)
{
final List<SearchModel> listFromJson = menu_list.map<SearchModel>((item) => SearchModel.fromJson(item)).toList();
setState(() {
_searchResult = listFromJson;
print("UI Updated");
});
}
else{
final snackBar = SnackBar(content: Text("No data available"));
_scaffoldKey.currentState.showSnackBar(snackBar);
}
} else {
final snackBar = SnackBar(content: Text(msg_response));
_scaffoldKey.currentState.showSnackBar(snackBar);
}
} else {
final snackBar = SnackBar(content: Text(msg_response));
_scaffoldKey.currentState.showSnackBar(snackBar);
}

Answer 2

Few discoveries:
1.
var menu_list = value['doc'];
This should not be
var menu_list = value['doc']['registrations'];
instead? The registrations is your list, not the doc.
2.
After you access the right element, then your model should look like this:
SearchModel.fromJson(json):
id = json['_id'].toString(),
name = json['name'].toString(),
category_name =json['category']['name'].toString();
Do note, that your category is list again (I don't know if it is intended), but if it is, then first you need to get each element from you category list and get the name of those.
Or you need something like this, if you have only 1 element there:
category_name =json['category'][0]['name'].toString();