Flutter/Dart - Unhandled Exception: type 'String' is not a subtype of type 'int' of 'index' - flutter

Question

I'm a beginner at Flutter and I'm currently following along with a tutorial to built a task planner (https://www.youtube.com/watch?v=xJSestoFlJ8&list=PLF9bFmu3NqWqchwS3DO9MDSl15IiHQWcr&index=9)
After rewriting the code by hand (the database, etc), when I restarted to app to show the items I saved into the database in the debug console, I got an error saying while working with initstate and setstate
Unhandled Exception: type 'String' is not a subtype of type 'int' of 'index'
Here is the code related to the error
final TextEditingController _textEditingController = TextEditingController();
var db = DatabaseHelper();
#override
void initState() {
super.initState();
_readTaskList();
}
void _handleSubmitted(String text) async {
_textEditingController.clear();
Tasks tasksItem = Tasks(text, DateTime.now().toIso8601String());
int savedItemId = await db.saveItem(tasksItem);
print("Item saved ID: $savedItemId");
}
_readTaskList() async {
List items = await db.getItems();
items.forEach((item) {
Tasks tasksItem = Tasks.map(items);
print("DB Items: ${tasksItem.itemName}");
});
}
and here is the full debug console log
E/flutter ( 8249): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: type 'String' is not a subtype of type 'int' of 'index'
E/flutter ( 8249): #0 new Tasks.map
package:gatorblocks_rbt/models/tasks.dart:12
E/flutter ( 8249): #1 _TaskPlannerState._readTaskList.<anonymous closure>
package:gatorblocks_rbt/pages/taskPlanner.dart:105
E/flutter ( 8249): #2 List.forEach (dart:core-patch/growable_array.dart:285:8)
E/flutter ( 8249): #3 _TaskPlannerState._readTaskList
package:gatorblocks_rbt/pages/taskPlanner.dart:104
E/flutter ( 8249): <asynchronous suspension>
E/flutter ( 8249): #4 _TaskPlannerState.initState
package:gatorblocks_rbt/pages/taskPlanner.dart:24
E/flutter ( 8249): #5 StatefulElement._firstBuild
package:flutter/…/widgets/framework.dart:4355
E/flutter ( 8249): #6 ComponentElement.mount
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #7 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #8 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #9 SingleChildRenderObjectElement.mount
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #10 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #11 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #12 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #13 Element.rebuild
package:flutter/…/widgets/framework.dart:3947
E/flutter ( 8249): #14 ComponentElement._firstBuild
package:flutter/…/widgets/framework.dart:4206
E/flutter ( 8249): #15 ComponentElement.mount
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #16 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #17 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #18 SingleChildRenderObjectElement.mount
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #19 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #20 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #21 SingleChildRenderObjectElement.mount
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #22 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #23 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #24 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #25 Element.rebuild
package:flutter/…/widgets/framework.dart:3947
E/flutter ( 8249): #26 ComponentElement._firstBuild
package:flutter/…/widgets/framework.dart:4206
E/flutter ( 8249): #27 StatefulElement._firstBuild
package:flutter/…/widgets/framework.dart:4381
E/flutter ( 8249): #28 ComponentElement.mount
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #29 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #30 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #31 SingleChildRenderObjectElement.mount
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #32 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #33 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #34 SingleChildRenderObjectElement.mount
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #35 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #36 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #37 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #38 Element.rebuild
package:flutter/…/widgets/framework.dart:3947
E/flutter ( 8249): #39 ComponentElement._firstBuild
package:flutter/…/widgets/framework.dart:4206
E/flutter ( 8249): #40 StatefulElement._firstBuild
package:flutter/…/widgets/framework.dart:4381
E/flutter ( 8249): #41 ComponentElement.mount
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #42 Element.inflateWidget
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #43 Element.updateChild
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #44 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #45 Element.rebuild (package:flutte
Here is a screenshot
The app works perfectly fine, it doesn't crash or anything, just fails to properly show the items that I've saved into the database.

Answer 1

You are getting the error because you are putting a int into a Text widget that accepts a String.
You can solve that by converting the int using the toString() method.
Check the code below: Replace it with your handleSubmitted function:
void _handleSubmitted(String text) async {
_textEditingController.clear();
Tasks tasksItem = Tasks(text, DateTime.now().toIso8601String());
int savedItemId = await db.saveItem(tasksItem);
// convert savedItemId to a string using toString() method
print("Item saved ID: $savedItemId.toString()");
}
I hope this helps.
UPDATED
After going through your code, I can see you are trying to access the field id which you didn't define in your Tasks constructor.
Why you are getting the error:
Type String is not a subtype of int index
Hope this solves your error.