How do I define an upstream asset in dagster-dbt, if the upstream asset has a prefix_key?

To define an upstream asset in Dagster with a

key_prefix

, you would typically use the

@asset

decorator and specify the

key_prefix

argument. When you want to define dependencies between assets, you can use the

deps

argument within the

@asset

decorator to specify upstream assets. Here's an example from the documentation that shows how you might define an upstream asset with a

key_prefix

and a downstream asset that depends on it:

python from dagster import asset, AssetKey  @asset(key_prefix="prefix") def upstream():     # ... upstream computation ...  @asset(deps={"upstream": AssetKey(["prefix", "upstream"])}) def downstream(upstream):     # ... downstream computation that depends on upstream ...

In this example, the

upstream

asset is defined with a

key_prefix

of

"prefix"

, which means its full asset key will be

AssetKey(["prefix", "upstream"])

. The

downstream

asset then specifies its dependency on the

upstream

asset by providing a dictionary to the

deps

argument, where the key is the argument name (

"upstream"

) and the value is the

AssetKey

of the upstream asset. If you are integrating with dbt and want to define a dbt asset as an upstream dependency of a non-dbt asset, you can use the

DbtManifest

class to fetch the asset key of a given source or model. This allows you to reference dbt models directly without having to manually construct the asset key. Here's an example from the documentation:

python from dagster_dbt import dbt_cli_resource, dbt_assets  manifest = dbt_cli_resource.configured({"project_dir": "path/to/dbt/project"}).manifest  @dbt_assets(manifest=manifest) def my_dbt_assets():     ...  @asset(non_argument_deps={manifest.get_asset_key_for_model("my_dbt_model")}) def downstream_asset():     # ... downstream computation that depends on a dbt model ...

In this example,

my_dbt_assets

is a collection of dbt assets loaded from a dbt project, and

downstream_asset

is a non-dbt asset that depends on a dbt model named

"my_dbt_model"

. The

non_argument_deps

argument is used to specify the dependency on the dbt model by using the

get_asset_key_for_model

method from the

DbtManifest

object. Please note that the exact syntax and methods may vary depending on the version of Dagster and dagster-dbt you are using, so it's important to refer to the specific documentation for your version to ensure you are using the correct API.