updateSubDocument method
Update a specific subdocument within a subcollection.
collectionPath - The path of the parent collection.
docId - The ID of the parent document.
subCollection - The name of the subcollection within the parent document.
subDocId - The ID of the subdocument to update.
data - A map containing the fields and values to update.
Implementation
Future<void> updateSubDocument(String collectionPath, String docId, String subCollection, String subDocId,
Map<String, dynamic> data) async {
await _db.collection(collectionPath).doc(docId).collection(subCollection).doc(subDocId).update(data);
}