How to post json object from array in http post request flutter? - arrays

Question

I am working on quiz I have saved the question id and the option id in array now I have to post these data in http post method in json object. I don't know how to convert array into json object
here is my http.post method..
submit(testId,List<String> answer) async {
try {
Response response = await post(
Uri.parse(NetworkConstants.BASE_URL + 'get-participate-to-test/${widget.id}'),
headers: {
"Authorization": "Bearer $token"
},
body:json.encode(
{
'test_id': testId,
'question': answer,
}
));
if (response.statusCode == 200) {
var data = jsonDecode(response.body.toString());
print(data);
showToast(context, data['message']);
// Navigator.of(context).pushAndRemoveUntil(
// MaterialPageRoute(builder: (context) => HomeScreen()),
// (Route<dynamic> route) => false);
} else {
var data = jsonDecode(response.body.toString());
print(data);
showToast(context, data['message']);
}
} catch (e) {
setState(() {
print(e);
});
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("Exception:"),
content: Text(e.toString()),
actions: [
TextButton(
child: Text("Try Again"),
onPressed: () {
Navigator.of(context).pop();
},
)
],
);
});
}
}
here I am sending Variable (answer) as list [{question_id: 2, option_id: 14}]
how to convert it in json encode object and post in the body of the method?

Answer 1

Here the answer is List of Map<String, int>. You are are already converting it to json by using json.encode in body.
submit(testId,List<Map, String> answer) async {
try {
Response response = await post(
Uri.parse(NetworkConstants.BASE_URL + 'get-participate-to-test/${widget.id}'),
headers: {
"Authorization": "Bearer $token"
},
body:json.encode(
{
'test_id': testId,
'question': answer,
}
));
if (response.statusCode == 200) {
var data = jsonDecode(response.body.toString());
print(data);
showToast(context, data['message']);
// Navigator.of(context).pushAndRemoveUntil(
// MaterialPageRoute(builder: (context) => HomeScreen()),
// (Route<dynamic> route) => false);
} else {
var data = jsonDecode(response.body.toString());
print(data);
showToast(context, data['message']);
}
} catch (e) {
setState(() {
print(e);
});
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("Exception:"),
content: Text(e.toString()),
actions: [
TextButton(
child: Text("Try Again"),
onPressed: () {
Navigator.of(context).pop();
},
)
],
);
});
}