oneWithID<T> method
Checks if a document exists in the RDB using its type and ID.
Implementation
@override
Future<bool> oneWithID<T>(Type type, String documentID, { String? subcollection }) async {
final String? className = RDB.classNames[type];
if (className == null) {
throw UnsupportedError('No class name found for type: $type. Consider re-generating Firestorm data classes.');
}
String path = RDB.constructPathForClassAndID(className, documentID, subcollection: subcollection);
final snapshot = await RDB.instance.ref(path).get();
return snapshot.exists;
}