How do you access the definition metadata for an upstream asset?

[jonathanbhaskar]

If I define metadata in the decorator of an asset, how do I grab that metadata in a downstream asset? For example, in the following code, how do I access the metadata of small_petals in downstream_asset through the context?

@asset(
    metadata={"dataset_name": "iris.small_petals"},
)
def small_petals():
    ...
    pass

@asset(deps=[small_petals])
def downstream_asset(context):
   ...

I understand there is a way to get the latest upstream materialization metadata through the context, but I'm confused about how to access the definition metadata. Any help would be appreciated.

[garethbrickman]

Definition-level metadata is typically meant for showing in the UI in a current context. So it's not automatically persisted on historical materialization events. Nevertheless, you can access it in a downstream asset by importing the asset's definition (defs):

@asset(deps=["usptream"])
def downstream():
    from top_level_module import defs

    upstream_metadata = defs.get_asset_graph().get(AssetKey("upstream")).metadata

[jonathanbhaskar]

Thank you!