The snapshot.data.documents
can't be accessed while getting messages from Cloud Firestore through StreamBuilder
.
Code:
class MessagesStream extends StatelessWidget {
@override
Widget build(BuildContext context) {
return StreamBuilder<QuerySnapshot>(
stream: _firestore.collection('messages').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(
backgroundColor: Colors.lightBlueAccent,
),
);
}
final messages = snapshot.data.documents.reversed;
List<MessageBubble> messageBubbles = [];
for (var message in messages) {
final messageText = message.data['text'];
final messageSender = message.data['sender'];
final currentUser = loggedInUser;
final messageBubble = MessageBubble(
sender: messageSender,
text: messageText,
isMe: currentUser == messageSender,
);
messageBubbles.add(messageBubble);
}
return Expanded(
child: ListView(
reverse: true,
padding:
const EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
children: messageBubbles,
),
);
},
);
}
}
Error:
The property 'documents' can't be unconditionally accessed because the receiver can be 'null'.
Is there any way to solve this bug or any other way in which my method can be successfully implemented ?