firestore doesnt show documents even though they are available - flutter

Question

I have following code to add data to firebasefirestore
Future<void> sendMessage({
required String msg,
required String id,
}) async {
var docId = getDocId(id); // returns sth like "AbcDe-FghiJ"
DocumentReference documentReferencer = chat.doc(docId).collection('chatMsg').doc();
Map<String, dynamic> data = <String, dynamic>{
"message": msg,
"sentBy": ownId,
"sentAt": DateFormat('yyyy-MM-dd – kk:mm:ss').format(DateTime.now())
};
await documentReferencer.set(data);
}
I used following code to get the data
StreamBuilder<QuerySnapshot>(
stream: firebaseInstance.collection('Messages').snapshots(),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.hasError || !snapshot.hasData) {
return const Center(
child: CircularProgressIndicator()
);
} else {
var data = snapshot.data.docs;
return listBuilder(data);
}
}
)
listBuilder(listData) {
return ListView.builder(
shrinkWrap: true,
itemCount: listData.length,
itemBuilder: (BuildContext context, int index) {
return Text(listData[index].id);
}
)
}
However, data show 0 items even though there is a document present.
My question is how can I get the list of documents from Messages?

Answer 1

I was having the same exact problem with subcollections on Firestore and even asked a question here to get some help over it. Though, it seems like the snapshots won't show the documents having a subcollection in them as there is no field inside any of them. So what I did to counter this was to just add anything (just a random variable) and then it was able to find the documents.
This is my current layout:
I've just added another line of code to just add this whenever I'm inserting a new subcollection.
collection
.set({
'dummy': 'data'
})
.then((_) => print('Added'))
.catchError((error) => print('Add failed: $error'));