Flutter List Value Being Unintentionally Updated - list

Question

In the code below the print for 'Second Sel Food Date' food date should match 'Initial Sel Food Date', but they don't because 'tempSelected[i].set_eatenDateTime = copyToDate.millisecondsSinceEpoch;' is updating both lists. How can I prevent foodListSelected from being updated? The initial values for foodListSelected are being passed into the class using a stream provider, if that matters.
List<FoodModel> tempSelected = new List();
for (var i = 0; i < foodListSelected.length; i++) {
tempSelected.add(foodListSelected[i]);
}
for (var i = 0; i < tempSelected.length; i++) {
print('Initital Sel Food Date: ' + DateFormat('E-MM-yyyy hh:mm:ss').format(DateTime.fromMillisecondsSinceEpoch(foodListSelected[i].eatenDateTime)));
DateTime eatenDateTime = DateTime.fromMillisecondsSinceEpoch(tempSelected[i].eatenDateTime);
DateTime copyToDate = DateTime(picked.year, picked.month, picked.day, eatenDateTime.hour, eatenDateTime.minute, eatenDateTime.second);
// ISSUE!!!!!
// This is some how setting foodListSelected[i].eatenDateTime as well.
tempSelected[i].set_eatenDateTime = copyToDate.millisecondsSinceEpoch;
tempSelected[i].set_selected = false;
_createFood('eaten_food', tempSelected[i]);
}
}
for (var i = 0; i < foodListSelected.length; i++) {
print('Second Sel Food Date: ' + DateFormat('E-MM-yyyy hh:mm:ss').format(DateTime.fromMillisecondsSinceEpoch(foodListSelected[i].eatenDateTime)));
foodListSelected[i].set_selected = false;
_updateEatenFood(foodListSelected[i]);
}

Answer 1

You are calling a mutator method on the same object which exists in both lists. If you want to create a new object copy for the second list, you should write a method that clones the current object, and use that in your first loop.