Ofir

Thank you for the quick response! It's really nice to know that projections also have the downcasting notion (from BaseSample to Sample), but what I meant relates to multiple subclasses....

My current approach is using one Document with a union of children for the "extra" properties: ```python3 class BaseSample(Document): s: str extra_params: Union[Sample1, Sample2] class Collection: name = "test" class...