I tried printing firebase data using stream, but instead of the data I got this in terminal " [ ] ". This means the data is null. But there is data in firebase, how do I solve this problem.

firebase's data

stream builder

StreamBuilder(
                stream: FirebaseFirestore.instance
                    .collection('paymentData')
                    .snapshots(),
                builder: (context, AsyncSnapshot<QuerySnapshot> snapshot) {
                  if (!snapshot.hasData) {
                    return const Center(
                      child: Text('Loading'),
                    );
                  }
                  print(snapshot.data!.docs);
                  return ListView(
                      children: snapshot.data!.docs.map((data) {
                    return ListTile(
                      title: Text(data['amount']),
                    );
                  }).toList());
                },
              ),

CodePudding user response：

Based on your firebase structure, there is no path called paymentData, it is actually a nested sub-collection, so in order to reach paymentData, you need to also include the parent of that collection, like this:

stream: FirebaseFirestore.instance
        .collection('lender').doc(yourLenderId).collection('paymentData')
        .snapshots(),

Get the lender ID from a previus step, which is the id of the document