addClasses method
Implementation
FutureOr<Map<String,dynamic>?> addClasses(DocumentSnapshot<Map<String,dynamic>> doc,{Idex? index})async{
if(!doc.exists)return null;
final r = doc.data()!..[consts.dataIdKey]=doc.id;
final entries=index?.entries;
if(entries==null)return r;
final futures=<Future>[];
r.forEach((k, v) {
if(entries.containsKey(k)) {
futures.add(Future(()=>handleValue(entries[k]!, doc[k])).then((v) => r[k]=v));
}
});
await Future.wait(futures);
r[consts.dataClassIdKey]=index!.id;
r[consts.dataClassNameKey]=index.name;
return r;
}