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#ask-ai
Title
# ask-ai
d

Darryl Ng

02/23/2024, 2:02 AM
@Scout how can I get the one immediate downstream asset of a given assetkey?
s

Scout

02/23/2024, 2:02 AM
To get the immediate downstream asset of a given
AssetKey
, you would typically need to access the asset graph which contains the dependency relationships between assets. However, the documentation does not provide a direct method or function call to retrieve only the immediate downstream asset of a given
AssetKey
. In practice, you would need to inspect the asset graph and identify the assets that have the given
AssetKey
as a dependency. This could involve programmatically traversing the asset graph to find the connections between assets. If you are looking for a way to do this within the context of a Dagster job or pipeline, you might need to write custom logic to inspect the asset dependencies based on your specific asset definitions and the structure of your asset graph. For more detailed guidance or specific use cases, you may want to refer to the asset graph-related classes and methods in the Dagster codebase or seek advice from the Dagster community, as the documentation does not explicitly detail how to retrieve only the immediate downstream asset of a given
AssetKey
.
d

Darryl Ng

02/23/2024, 2:30 AM
@Scout how can I dereference AssetSelection into AssetKeys
s

Scout

02/23/2024, 2:30 AM
To dereference an
AssetSelection
into
AssetKeys
, you would typically use the asset graph and the selection to resolve the specific assets that are included in the selection. However, the documentation does not provide a direct method or function call to dereference an
AssetSelection
into
AssetKeys
. In the context of a Dagster job or pipeline,
AssetSelection
is used to define subsets of assets that you want to include in a job. The actual resolution of
AssetSelection
to
AssetKeys
happens internally within Dagster when the job is executed, and the relevant assets are materialized or processed. If you need to programmatically access the
AssetKeys
from an
AssetSelection
, you might need to interact with the repository or asset graph API to resolve the selection based on the definitions and relationships of assets within your repository. One potential approach, as mentioned in a discussion on the Dagster GitHub, is to use the
assets_defs_by_key
property from the
ScheduleEvaluationContext
or a similar context object that provides access to the asset definitions by key. This would allow you to map from
AssetKey
to
AssetDefinition
, and potentially vice versa, but this is more about accessing definitions rather than dereferencing an
AssetSelection
. For specific guidance on how to dereference an
AssetSelection
into
AssetKeys
, you may need to consult the Dagster codebase or seek advice from the Dagster community, as the documentation does not provide a clear method for doing this directly.