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
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.
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.