specificFiledValue_query

          var collectionReference = FirebaseFirestore.instance.collection('users');
          var query = collectionReference.where('id', isEqualTo: firebaseAuth.currentUser!.uid );
          var querySnapshot = await query.get();

          if (querySnapshot.docs.isNotEmpty) {
            // Access the first document (you may need to loop through if you expect multiple matches)
            var document = querySnapshot.docs[0].data();

            // Access the specific field in the document
            var specificElement = document['username'];

            // Now you can work with the specific element
            print('Found specific element: $specificElement');
          } else {
            print('No matching documents found.');
          }