I wanted to follow up on this thread. Mike’s suggestion above <https://groups.google.com/g/sqlalchemy/c/nHz9z_P15qg/m/HWk8g8gGCAAJ> worked, and considering the related discussion Dataclasses and Composites with init-only variables <https://github.com/sqlalchemy/sqlalchemy/discussions/10988> I adjusted the code somewhat: instead of using the *nullable_point()* function (from above) I extended the *as_composite()* class method (from the other thread) as suggested:
*@classmethod* *def as_composite(cls, x: int | None, y: int | None) -> Point | None:* * if x is None and y is None:* * return None* * return Point(x, y)* Then adjust the mapper types accordingly, and that’s it 👍🏼 Thanks! Jens -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/2e52030a-8772-4876-8c74-1f607d2af049n%40googlegroups.com.
