Query a document value in a nested collection in firebase - firebase

Question

I need to get the values from a document with this schema in Firebase:
COLLECTION => DOCUMENT => COLLECTION => DOCUMENT
userPolls => userId => dailyPolls => 20200825 => pollDate: "2020/08/25"
status: "Under PUM"
statusCode: "pum"
uid: "zwQnrrBdNCemWyXEW2LHmw8LejA2"
This is my attempt at it. But I think I am getting it wrong in flutter
final CollectionReference userPollCollection =
Firestore.instance.collection('userPolls');
Future getPoll() async {
final DateTime now = DateTime.now();
final DateFormat formatter = DateFormat('yyyy/MM/dd');
final String formatted = formatter.format(now);
var pollDate = formatted;
var docRef = await applicationUser
.document(userId)
.collection('dailyPolls')
.document(pollDate);
docRef.get().then((onValue) => {print(onValue.data['status'])});
}
I know that this is not right. Can you please show me how? Thank you.
EDIT
For reference, this is how I ADD data to the firestore db:
Future setPoll(UserPoll userPoll) async {
var dt = userPoll.pollDate.replaceAll('/', '');
return await userPollCollection
.document(userId)
.collection('daillyPolls')
.document(dt)
.setData({
'uid': userId,
'pollDate': userPoll.pollDate,
'status': userPoll.status,
'statusCode': userPoll.statusCode
});
}
This is how I try to get it
Future getPoll() async {
final DateTime now = DateTime.now();
final DateFormat formatter = DateFormat('yyyy/MM/dd');
final String formatted = formatter.format(now);
var pollDate = formatted;
var dt = pollDate.replaceAll('/', '');
var docRef = userPollCollection
.document(userId)
.collection('dailyPolls')
.document(dt);
docRef.get().then((onValue) {
print(onValue.data);
});
}
}
If I use this code based on the help of Peter Haddad, I get a null value when printing my result.data

Answer 1

You have to do the following:
var docRef = Firestore.instance.collection("userPolls").document(userId).collection('dailyPolls').where("pollDate", isEqualTo: pollDate);
var result = await docRef.getDocuments();
result.documents.forEach((result) {
print(result.data);
});
});
Since pollDate is an attribute inside a document then you can use the where() method to query and get the document