How to make my flutter app read upadated json file instead of old json file? - json

Question

I made a app where I have to first read local json file and updated some content of it inside app and save that file and without closing the app I want to display the changes by reading updated json file.
I am able to read my json file, save changes in that file but when I try to see my changes without closing the app by reading that json file, it always show my previous data. But if I close my app and open it again It show read new updated file.
How can I show changes by reading updated json file without closing the app??
This is my code:
First I read json file inside initstate:
Future<void> readJson() async {
final String response =
await rootBundle.loadString('jsonfile/primary_values.json');
final data = jsonDecode(response);
var values = PrimaryValueJson.fromJson(data);
setState(() {
if (primaryKey == 'Doctor SSN :') {
widget.primaryIndex = values.doc_ssn;
widget.primaryValue = 'DC0${widget.primaryIndex}';
print(widget.primaryValue);
print('this is readjson');
}
});
}
#override
void initState() {
super.initState();
print("I am doctor init screen");
readJson();
}
And then I increment Doc.ssn by 1 and write it by clicking a button. Function associated with that button is:
_writeJson() async {
print("this is 1st line writejson: ${widget.primaryIndex}");
String response =
await rootBundle.loadString('jsonfile/primary_values.json');
File path = File('jsonfile/primary_values.json');
var data = jsonDecode(response);
var values = PrimaryValueJson.fromJson(data);
final PrimaryValueJson doctor = PrimaryValueJson(
doc_ssn: values.doc_ssn + 1,
phar_id: values.phar_id,
ssn: values.ssn,
);
final update = doctor.toJson();
path.writeAsStringSync(json.encode(update));
print('this is writejson:${doctor.doc_ssn}');
nameController.text = '';
specialityController.text = '';
experienceController.text = '';
widget.primaryIndex = doctor.doc_ssn;
widget.primaryValue = 'DC0${doctor.doc_ssn}';
}
Future<void> insertRecord(context) async {
count = count + 1;
if (nameController.text == '' ||
specialityController.text == '' ||
experienceController.text == '') {
print("Please fill all fields");
} else {
try {
String uri = "http://localhost/hospital_MS_api/insert_doctor.php";
var res = await http.post(Uri.parse(uri), body: {
"Doc_SSN": widget.primaryValue,
"name": nameController.text,
"speciality": specialityController.text,
"experience": experienceController.text,
});
setState(() {
_writeJson();
});
var response = jsonDecode(res.body);
if (response["success"] == "true") {
print("Record Inserted");
} else {
print("Record not inserted");
}
} catch (e) {
print(e);
}
}
}

Answer 1

Assets are read-only. After writing an asset file to a file, read also from that file.
File path = File('jsonfile/primary_values.json');
...
path.writeAsStringSync(json.encode(update));
...
var data = jsonDecode(path.readAsBytesSync());