the following asset:

@asset
def some_asset():
    
    output = "some_great_output"

    return Output(
        value=output,
        output_name=some_name,
    )

raises this error:

dagster._core.errors.DagsterInvariantViolationError: Bad state: Output was explicitly named 'some_name', which does not match the output definition specified for position 0: 'result'.

how do i fix this?

@asset
def some_asset():
    
    output = "some_great_output"

    return Output(
        value=output,
    )

you don’t need to specify the name

thanks @yuhan! i know i don’t need to specify an output name, but i want to. i feel there are cases where you need to wrap your output into an

Output

object even for a (non-multi) asset, e.g. to attach metadata to it (correct me if that’s wrong). but if you wrap your output into an

Output

object, the asset gets the default name “result” - not exactly a very useful name for an asset. hence my need to give it an explicit name. that should be possible somehow, right?

if you’d want to attach metadata to an asset output, you can use

context.add_output_metadata

too. here’s an example: https://github.com/dagster-io/dagster/blob/master/examples/quickstart_etl/quickstart_etl/assets/hackernews.py#L40-L49 as for “result” isn’t useful name, when you’re using the single asset with single output (1:1 mapping), the name “result” becomes an implementation detail because the output metadata will show up in that asset page, which is why

@asset

doesn’t have the

outs

argument bc it doesn’t need to. that being said, if you do need to

return Output

, you can

return Output(name="result",…)