Cannot Get StreamBuilder Data - flutter

Question

I am trying to get the updated data from a stream but, even though I get data coming down in my future function, the snapshot.data give me this error:
type '_ControllerStream<dynamic>' is not a subtype of type 'Iterable<dynamic>'
Here is my function and stream:
Future getChat(orderId) async {
SharedPreferences prefs = await SharedPreferences.getInstance();
var _token = prefs.getString('token');
print('The Latest Order Token is $_token');
final Map<String, dynamic> body = {
"id": "$orderId",
};
final List _messageData = [];
var url = Uri.parse('$_server/api/driver/get/convo/?access_token=$_token');
await http.post(url, body: body, headers: {
"Content-Type": 'application/x-www-form-urlencoded'
}).then((http.Response response) {
print(response.body);
switch (response.statusCode) {
case 200:
final Map<String, dynamic> responseData = json.decode(response.body);
print("The ${response.body}");
var x = responseData['message_data'].split(",");
print(x);
for (int i = 0; i < x.length; i++) {
_messageData.add(x[i]);
print(x[i]);
}
print(x);
break;
default:
final Map<String, dynamic> responseData = json.decode(response.body);
print(responseData);
return _messageData;
}
return _messageData;
});
}
Stream getChatData(Duration refreshTime, id) async* {
while (true) {
await Future.delayed(refreshTime);
yield getChat(id).asStream();
}
}
I get this in the data response:
"message_data": ""11-12-21:09:01:14AM - Billy Fakename: fire
test,11-12-21:09:01:30AM - Test TEster: ewserasece,""
My stream builder is:
Stream _chatStream;
#override
void initState() {
_chatStream = getChatData(Duration(seconds: 3), orderid);
super.initState();
}
StreamBuilder(
stream: _chatStream,
builder: (context, snapshot) {
if (snapshot.hasData) {
final messages = snapshot.data;
List<MessageBubble> messageWidgets = [];
for (var message in messages) {
final msgText = message;
final msgSender = message;
// final msgSenderEmail = message.data['senderemail'];
final currentUser = "loggedInUser.displayName";
// print('MSG'+msgSender + ' CURR'+currentUser);
final msgBubble = MessageBubble(
msgText: msgText,
msgSender: msgSender,
user: currentUser == msgSender);
messageWidgets.add(msgBubble);
}
return Expanded(
child: ListView(
reverse: true,
padding:
EdgeInsets.symmetric(vertical: 15, horizontal: 10),
children: messageWidgets,
),
);
} else {
return Center();
}
},
),
But, I get this error: type '_ControllerStream' is not a subtype of type 'Iterable' or the snapshot will be null.
How do I get the information that shows up in the future function, show up in the stream?

Answer 1

Could you show us where you define _chatStream ?
Your StreamBuilder uses _chatStream but you only showed us where you define the method
Future getChat(orderId)
and the method
Stream getChatData(Duration refreshTime, id)
where you create a stream that you do not use in the code you've shared.
Did you want to use getChatData in your StreamBuilder?
Did I miss something?