Hi, are there any examples on how to get custom run metadata from dbt runs? I want to get the row count of the model after its materialization (and plot it in the UI)

hi @Peter Lim!

runtime_metadata_fn

(https://docs.dagster.io/_apidocs/libraries/dagster-dbt#assets-dbt-core) sounds like what you're looking for here

thank you for the reply, Owen! Do you have an example function for this?

yeah it's got a pretty nasty type signature for something with no examples 😬 . Easiest way to think about it is that it's a function with two arguments. The first is a

context

argument (that's the same thing that's passed into the

context

argument of an asset), and the second is a dictionary of metadata parsed out of the

manifest.json

file. So one example would be

def custom_metadata_fn(context, node_info):
    table_name = node_info["name"]
    table_schema = node_info["schema"]
    n_rows = ... # query database
    return {"n_rows": n_rows}

thank you! I will try this out tomorrow 🙂