Hi, Is there way to stop materializing assets without getting error dagster._core.errors.DagsterTypeCheckDidNotPass. For example, I do requests into DB, if there rows I want to pass them to next assets, if not then just stop without error. Also i don`t want check incoming data in asset. Is there way to validate incoming data, if it not valid just not run asset?

hi @Яхья Сакалов! In this case, I think you'd want to mark your asset with

output_required=False

, then only yield an Output if rows exist. Something like

@asset(output_required=False)
def my_asset():
    rows = ...
    if len(rows) > 0:
        yield Output(rows)

thanks for answer, yes, I already found this argument for

asset

but this method works only if your function is decodator, but it will be good if there will be same behaviour for classical function

I might not be following that question 100%, but one pattern some users have found success with is writing their own custom wrapper for the asset decorator. So you can define some custom behavior inside your own

my_custom_asset

decorator, then annotate your assets with

@my_custom_asset
def some_asset():
    ...