Bad state: field does not exist within the DocumentSnapshotPlatform | flutter - flutter

Question

How to fix this,
error says,
════════ Exception caught by widgets library ═══════════════════════════════════
The following StateError was thrown building:
Bad state: field does not exist within the DocumentSnapshotPlatform
Another problem is when the user searches for something, the app should show the username without considering capital, simple words
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
import 'package:insta/utils/colors.dart';
class SearchScreen extends StatefulWidget {
const SearchScreen({super.key});
#override
State<SearchScreen> createState() => _SearchScreenState();
}
class _SearchScreenState extends State<SearchScreen> {
final TextEditingController searchCon = TextEditingController();
bool isShowUsers = false;
#override
void dispose() {
searchCon.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: mobileBackgroundColor,
title: TextFormField(
controller: searchCon,
decoration: const InputDecoration(
labelText: "Search for a user",
),
onChanged: (value) {
setState(() {
isShowUsers = true;
});
},
// onFieldSubmitted: (String _) {
// setState(() {
// isShowUsers = true;
// });
// },
),
),
body: isShowUsers
? FutureBuilder(
future: FirebaseFirestore.instance
.collection('users')
.where(
'username',
isGreaterThanOrEqualTo: searchCon.text,
)
.get(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return const Center(
child: CircularProgressIndicator(),
);
}
return ListView.builder(
itemCount: (snapshot.data! as dynamic).docs.length,
itemBuilder: (context, index) {
return ListTile(
leading: CircleAvatar(
backgroundImage: NetworkImage(
(snapshot.data! as dynamic).docs[index]
['photoUrl']),
),
title: Text(
(snapshot.data! as dynamic).docs[index]['username']),
);
},
);
},
)
: FutureBuilder(
future: FirebaseFirestore.instance.collection('posts').get(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Center(child: const CircularProgressIndicator());
}
return StaggeredGridView.countBuilder(
crossAxisCount: 3,
itemCount: (snapshot.data! as dynamic).docs.length,
itemBuilder: (context, index) => Image.network(
(snapshot.data! as dynamic).docs[index]['postUrl'],
fit: BoxFit.cover,
),
staggeredTileBuilder: (index) => StaggeredTile.count(
(index % 7 == 0) ? 2 : 1, (index % 7 == 0) ? 2 : 1),
mainAxisSpacing: 8.0,
crossAxisSpacing: 8.0,
);
},
),
);
}
}
`

Answer 1

Got this error while working with firebase its due to when you are trying to access the document doesn't exist or check the spelling, syntax when you access them