Recursive Query: How to parse data?

[komakur]

Say I am having a data like:

fragment DataRecursive on DataModel {
    id
    parentId
    children {
        id
        parentId
        children {
            id
            parentId
// add more nesting if needed
        }
    }
}

query FetchData {
    data {
        dataGroup1 {
           ...DataRecursive
        }
        dataGroup2 {
            ...DataRecursive
        }
    }
}

Since the dart class is going to look something like:

class Data {
  const Data({
    required this.dataGroup1,
    required this.dataGroup2,
  });

  factory Data.fromGraphQL(GFetchData data) {
    return Data(
      dataGroup1:
          data.data.dataGroup1
              ?.map((c) => DataNode.fromJson(c.toJson()))
              .toList() ??
          [],
      dataGroup2:
          data.data.dataGroup2
              ?.map((r) => DataNode.fromJson(r.toJson()))
              .toList() ??
          [],
    );
  }

  final List<DataNode> dataGroup1;
  final List<DataNode> dataGroup2;
}

The question here is how to omit using fromJson(r.toJson()) to properly parse the data?

The issue is that there are different classes generated for each dataGroup