flutter firestore combine user data to result
class Message {
final message;
final timestamp;
final uid;
final user;
const Message(this.message, this.timestamp, this.uid, this.user);
}
class ChatList extends StatelessWidget {
Stream<List<Message>> getData() async* {
var messagesStream = Firestore.instance.collection("chat").orderBy("timestamp", descending: true).snapshots();
var messages = List<Message>();
await for (var messagesSnapshot in messagesStream) {
for (var messageDoc in messagesSnapshot.documents) {
var message;
if (messageDoc["uid"] != null) {
var userSnapshot = await Firestore.instance.collection("users").document(messageDoc["uid"]).get();
message = Message(messageDoc["message"], messageDoc["timestamp"], messageDoc["uid"], userSnapshot["name"]);
}
else {
message = Message(messageDoc["message"], messageDoc["timestamp"], "", "");
}
messages.add(message);
}
yield messages;
}
}
@override
Widget build(BuildContext context) {
var streamBuilder = StreamBuilder<List<Message>>(
stream: getData(),
builder: (BuildContext context, AsyncSnapshot<List<Message>> messagesSnapshot) {
if (messagesSnapshot.hasError)
return new Text('Error: ${messagesSnapshot.error}');
switch (messagesSnapshot.connectionState) {
case ConnectionState.waiting: return new Text("Loading...");
default:
return new ListView(
children: messagesSnapshot.data.map((Message msg) {
return new ListTile(
title: new Text(msg.message),
subtitle: new Text(DateTime.fromMillisecondsSinceEpoch(msg.timestamp).toString()
+"\n"+(msg.user ?? msg.uid)),
);
}).toList()
);
}
}
);
return streamBuilder;
}
}