How to retrive firebase subDocs - flutter - firebase

Question

I want to retrieve a sub doc from Firebase, I need to collect the number of questions asked and answered by a particular user on their profile page, I am successfully retrieving the no of questions, cuz it's in the main doc,image 1, main doc, but I am not able to retrieve the answers, its a sub doc of questions image 2 sub doc, I tried playing with changing from AsyncSnaphot - DocumentSnapshot - dynamic, but no luck anywhere. Thanking you in advance.
```Widget followers(
BuildContext context, AsyncSnapshot<DocumentSnapshot> asyncSnapshot) {
return Container(
color: constantColors.green,
height: MediaQuery.of(context).size.height*0.09,
child: Row(
children: [
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('questions')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return Container();
} else {
return Provider.of<Authentication>(context, listen: false)
.getUserUid ==
asyncSnapshot.data.data()['user uid']
? Text(snapshot.data.docs.length.toString(), style: TextStyle(fontSize: 24),)
: Text('0');
}
}),
Text('asked'),
],
),
Column(
children: [
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('questions').doc().collection('answers')
.snapshots(),
builder: (context, snapshot){
if (snapshot.connectionState == ConnectionState.waiting) {
return Container();
} else {
return Provider.of<Authentication>(context, listen: false)
.getUserUid ==
asyncSnapshot.data.data()['user uid']
? Text(snapshot.data.docs.length.toString(), style: TextStyle(fontSize: 24),)
: Text('0');
}
}),
Text('answered')
],
)
],
),
);
} ```
Edit: Adding more code of my answer adding to the firebase feature
answerAdder(BuildContext context,
AsyncSnapshot<DocumentSnapshot> documentSnapshot, String QuesID) {
return showModalBottomSheet(
elevation: 0,
backgroundColor: Colors.transparent,
isScrollControlled: true,
context: context,
builder: (context) {
return Container(
height: MediaQuery.of(context).size.height * 0.8,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.symmetric(horizontal: 5),
decoration: BoxDecoration(
color: constantColors.white,
borderRadius: BorderRadius.only(
topRight: Radius.circular(25), topLeft: Radius.circular(25)),
),
child: Column(
children: [
Divider(
indent: 110,
endIndent: 110,
thickness: 4,
color: Colors.grey,
),
Padding(
padding: const EdgeInsets.all(5.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
MaterialButton(
onPressed: () {
Provider.of<PostFunctions>(context, listen: false)
.addAnswer(
context,
documentSnapshot.data.data()['question id'],
answerController.text,
titleController.text)
.whenComplete(() {
Navigator.pop(context);
});
Navigator.pop(context);
},
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15)),
color: constantColors.cyangrad,
child: Text(
'add answer',
style: TextStyle(fontWeight: FontWeight.w600),
),
)
],
),
),
Container(
height: MediaQuery.of(context).size.height * 0.2,
child: Padding(
padding: const EdgeInsets.all(5.0),
child: TextField(
controller: answerController,
maxLines: 8,
cursorColor: constantColors.green,
decoration: InputDecoration(
contentPadding: EdgeInsets.all(15),
hintText: 'Please enter your answer',
isDense: true,
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(20),
borderSide: BorderSide.none),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(20),
borderSide: BorderSide.none),
fillColor: Colors.grey[300],
filled: true),
),
),
),
Container(
height: MediaQuery.of(context).size.height * 0.2,
child: Padding(
padding: const EdgeInsets.all(5.0),
child: TextField(
controller: titleController,
maxLines: 8,
cursorColor: constantColors.green,
decoration: InputDecoration(
contentPadding: EdgeInsets.all(15),
hintText: 'Please enter your title',
isDense: true,
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(20),
borderSide: BorderSide.none),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(20),
borderSide: BorderSide.none),
fillColor: Colors.grey[300],
filled: true),
),
),
),
],
),
);
});}
Future method of uploading answer
Future addAnswer(BuildContext context, String postId,
String answer, String answerTitle) async {
return FirebaseFirestore.instance
.collection('questions')
.doc(postId)
.collection('answers')
.doc(answerTitle)
.set({
'answer': answer,
'username': Provider.of<FirebaseOps>(context, listen: false).initUsername,
'user uid':
Provider.of<Authentication>(context, listen: false).getUserUid,
'userimage':
Provider.of<FirebaseOps>(context, listen: false).initUserimage,
'useremail':
Provider.of<FirebaseOps>(context, listen: false).initUseremail,
'time': Timestamp.now(),
});
}

Answer 1

The issue is in .collection('questions').doc().collection('answers')
You need to pass the doc name in the doc() function. Consider it as a path!
By your example, it should be: .collection('questions').doc('hoo lala').collection('answers')