Is there an (elegant) way to define what subset of assets in a

multi_asset

is required? For a current use case, I have a

multi_asset

generating roughly 8 assets, of which either all 8 or only a specific subset of them would be expected. I would know at runtime which case (all assets or subset) the run falls under.

Possibly relevant: https://docs.dagster.io/concepts/assets/multi-assets#dependencies-inside-multi-assets

cc @owen, but I believe you could provide an asset selection to job construction for example that cross-cuts your multi asset

Hi @Vinnie! There's no super-elegant way to describe this, to the asset layer, multi assets are basically just "you have to materialize all of these" or "you can materialize any subset of these". For your very specific use case, I think you could mark the "specific subset" of assets with

AssetOut(is_required=True)

, with the others as

AssetOut(is_required=False)

, which would at the very least error (at runtime) if you tried to materialize a subset that didn't contain all of the required ones

Hm yeah that’s what I wound up doing. I guess I’ll build a check into the asset function that alerts in case not all are materialized.