firestore data fetch and insert in flutter.

 1.fireStore data fetch in flutter app.

SizedBox(
  height: 300,
  width: 100,
  child: StreamBuilder<QuerySnapshot>(

    stream: FirebaseFirestore.instance.collection('isNotEv').snapshots(),
    builder: (context, snapshot) {
      if (snapshot.hasData) {
        return ListView.builder(
          itemCount:snapshot.data!.docs.length,
            itemBuilder: (context, index) {
            return ListTile(

              title: Text( snapshot.data!.docs[index]['farePerKm'].toString()),


            );
          },
        );
      } else if (snapshot.hasError) {
        return Text('Error: ${snapshot.error}');
      } else {
        return const CircularProgressIndicator();
      }
    },
  ),
),

2. insert the data in firestore.

Future<void> addNewDocument() async {
  try {
    // Get the reference to the Firestore collection where you want to add the document
    CollectionReference collectionReference = FirebaseFirestore.instance.collection('isEv');

    // Add the document to the collection without specifying the document ID
    DocumentReference documentReference = await collectionReference.add({
      'field1': 'value1',
      'field2': 'value2',
      // Add more fields as needed
    });

    // Fetch the autogenerated document ID
    String autogeneratedDocumentId = documentReference.id;
    print('Autogenerated Document ID: $autogeneratedDocumentId');
  } catch (e) {
    print('Error adding document: $e');
  }
}

3.fetch data in log

void getride() async {
  //userModelCurrentInfo
  log("Ride Requests");
  QuerySnapshot querySnapshot =
  await FirebaseFirestore.instance.collection("allUsers")
      .doc("customer")
      .collection("customers")
      .get();
//sub-patch
  for (int i = 0; i < querySnapshot.size; i++) {
    var a = querySnapshot.docs[i];

    String st="Rc5qR3t74kf02JwDICZD";

    if ( st==a.id){

    //log(st!);
    log("firstName: ${a['firstName']}");
    }
  }
}