Hey! Ive run into a somewhat unique issue. I have a

@graph_multi_asset

that accepts a set of Asset Keys as ins. There are some cases where two of the ins are the same Asset/AssetKey. In this case, the build_asset_ins method will eliminate one of the two keys in the mapping. Thus causing the dagster invariant checker to not see one of the inputs. Any help or workaround is much appreciated!

Maybe I'm missing something, I thought asset keys are unique within the system. If you have multiple entries pointing to the same asset key wouldn't you just use the same reference?

It is the same reference, same object

Hi Jordan, could you elaborate on what you’re aiming for with multiple asset copies of the same asset key in the inputs-- this is outside of Dagster’s model, where an asset has a set of dependencies on other assets (@Le Yang is correct), which is why the keys are de-duped.

So I’d like to keep a singular asset copy as the input for multiple keys. It is sometimes the case that two inputs to the graph asset will be the same file based on the functionality. So letting two of the inputs be the same graph asset is the main goal. It isn’t always the case, but it sometimes will be.

Would you mind posting some simple example code so I can make sure we’re on the same page?

for sure! gimme one sec

Hmmm-- I am pretty sure that the assumption of a one-to-one relationship between input names and asset keys is baked in at a fairly deep level. It seems to me that if you are using a factory, you shouldn’t need to define multiple inputs with the same key-- can you dedup at the top of the factory to determine the number of unique inputs and construct the graph asset accordingly?

I can try that out!