Put request in flutter ,does not update the object when I change only one field on edit screen - flutter

Question

When making a put request and I edit all the field the object is updated. But if I only update one field on the edit screen than the object is not update. I think this is because the unchanged controllers do not keep the value that is already given to them in the Set state method.
Can anyone give me some hints how to solve this ?
import 'package:fin_app/apiservice/variables.dart';
import 'package:fin_app/screens/reminder/reminder_screen.dart';
import 'package:fin_app/screens/login_screen/login_screen.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import '../../models/user.dart';
import '../monthly_expense/expense_app_theme.dart';
const String myhomepageRoute = '/';
const String myprofileRoute = 'profile';
class ReminderEdit extends StatefulWidget {
final String id;
final String title;
final String date;
final int amount;
const ReminderEdit({Key? key, required this.id, required this.title,required this.date,required this.amount}) : super(key: key);
#override
_ReminderEditState createState() => _ReminderEditState();
}
class _ReminderEditState extends State<ReminderEdit> {
final GlobalKey<FormState> _formKey = GlobalKey();
String id="";
final TextEditingController _titleInput = TextEditingController();
final TextEditingController _dateInput = TextEditingController();
final TextEditingController _amountInput = TextEditingController();
Future<Reminder>? _futureReminder;
Future<void> edit(String id,String title,String date,int amount) async {
Map<String, String> requestHeaders = {
'Content-type': 'application/json',
'Accept': 'application/json',
'Authorization': 'Bearer $token'
};
final editReminder = jsonEncode({
'title': title,
'date': date,
'amount': amount
});
if (_titleInput.text.isNotEmpty &&
_dateInput.text.isNotEmpty ) {
var response = await http.put(
Uri.parse("$baseUrl/reminder/me/$id/details"),
body: editReminder,
headers: requestHeaders);
if (response.statusCode == 200) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text("Profile edited succesfully.")));
} else {
print(response.statusCode);
print(id);
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text("Could not edit the reminder.")));
}
} else {
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(content: Text("Please fill out the field.")));
}
}
#override
void initState() {
_dateInput.text = ""; //set the initial value of text field
super.initState();
setState(() {
id = widget.id;
_titleInput.text = widget.title;
_dateInput.text = widget.date;
_amountInput.text=widget.amount.toString();
});
}
void navigate() {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => AlarmPage()),
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: ExpenseAppTheme.background,
body: Padding(
padding: const EdgeInsets.all(16.0),
child: ListView(
children: <Widget>[
const Align(
alignment: Alignment.topLeft,
child: Text("Edit reminder",
style: TextStyle(
fontSize: 24,
)),
),
const SizedBox(
height: 20,
),
Form(
key: _formKey,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
TextFormField(
controller: _titleInput,
decoration: const InputDecoration(
labelText: 'Title',
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(20.0)),
borderSide:
BorderSide(color: Colors.grey, width: 0.0),
),
border: OutlineInputBorder()),
keyboardType: TextInputType.number,
validator: (value) {
if (value == null ||
value.isEmpty ||
value.contains(RegExp(r'^[a-zA-Z\-]'))) {
return 'Use only text!';
}
},
),
const SizedBox(
height: 20,
),
TextFormField(
controller:_dateInput, //editing controller of this TextField
decoration: InputDecoration(
icon: Icon(Icons.calendar_today), //icon of text field
labelText: "Enter Date" //label text of field
),
readOnly:
true, //set it true, so that user will not able to edit text
onTap: () async {
DateTime? pickedDate = await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(
2000), //DateTime.now() - not to allow to choose before today.
lastDate: DateTime(2101));
if (pickedDate != null) {
print(
pickedDate); //pickedDate output format => 2021-03-10 00:00:00.000
String formattedDate =
DateFormat('yyyy-MM-dd').format(pickedDate);
print(
formattedDate); //formatted date output using intl package => 2021-03-16
//you can implement different kind of Date Format here according to your requirement
setState(() {
_dateInput.text =
formattedDate; //set output date to TextField value.
});
} else {
print("Date is not selected");
}
},
),
const SizedBox(
height: 35,
),
TextFormField(
controller: _amountInput,
decoration: const InputDecoration(
labelText: 'Amount',
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(20.0)),
borderSide:
BorderSide(color: Colors.grey, width: 0.0),
),
border: OutlineInputBorder()),
validator: (value) {
if (value == null || value.isEmpty) {
return 'Amount must not be empty';
} else if (value.contains(RegExp(r'^[0-9]*$'))) {
return 'Amount must only contain numbers';
}
},
), const SizedBox(
height: 20,
),
ElevatedButton(
style: ElevatedButton.styleFrom(
minimumSize: const Size.fromHeight(60)),
onPressed: () {
edit(widget.id,_titleInput.text,_dateInput.text,int.parse(_amountInput.text));
navigate();
},
child: const Text("Submit"),
),
],
),
),
],
),
),
);
}
FutureBuilder<Reminder> buildFutureBuilder() {
return FutureBuilder<Reminder>(
future: _futureReminder,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text('Expense added');
} else if (snapshot.hasError) {
return Text('${snapshot.error}');
}
return const CircularProgressIndicator();
},
);
}
}