reading data from firebase firestore collection at stream builder - flutter

Question

I got trouble with firebase fireStore.
There is a stream builder reading data from items collection.
Inside items collection there is some fields and another collections.
I haven't any problem with fields, the problem is with collection.
how to access those collections inside stream builder?
StreamBuilder<QuerySnapshot<Map<String, dynamic>>>(
stream: CallApi().finalReference(reference: widget.finalReference),
builder: (context, snapshot) {
if (snapshot.hasError) {
return Center(child: Text('snapshot Error:${snapshot.error}'));
}
if (snapshot.hasData) {
var snapData = snapshot.data!.docs;
if (kDebugMode) {
print(snapData.length);
}
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Expanded(
child: ListView.builder(
itemCount: snapData.length,
itemBuilder: (BuildContext context, int index) {
return ListItem(
mTitle: snapData[index].get('title') ?? '',
mSubTitle: snapData[index].get('address') ?? 'empty',
mPrice: snapData[index].get('price') ?? '',
mImageUrl: snapData[index].get('gallery')[0],
mOnTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DetailsPage(
adsTitle: snapData[index].get('title'),
adsSubTitle: snapData[index].get('subTitle'),
gallery: snapData[index].get('gallery'),
specFTitle: snapData[index].get('gallery'),
),
),
);
},
);
},
),
),
],
);
}
return const Center(child: CircularProgressIndicator());
},
),
here is firebase

Answer 1

Reading data from Firestore is a shallow operation. When you read a document, its subcollection are not automatically read.
So if you want to get the data from the subcollections of the current document, you will have to start a new read operation for that. If you want to show that data in the UI, you can use a new, nested StreamBuilder or FutureBuilder for that.