https://dagster.io/ logo
#ask-ai
Title
# ask-ai
s

Shane Keller

03/09/2024, 10:32 PM
When running a MaterializeResult, do I specify the return value?
s

Scout

03/09/2024, 10:32 PM
When you use
MaterializeResult
in Dagster, it is a class that can be optionally returned from an
@asset
to report metadata, code version, and other information about the asset. The
MaterializeResult
can include a
value
field that you specify as the return value. This is useful when you want to pass scalar values to access in downstream assets. Here's an example from the documentation that illustrates how you might use
MaterializeResult
with a `value`:
Copy code
python @asset  def table_1():     full_table_name = "my_schema.table_1"     snowflake.query(f"CREATE TABLE {full_table_name} ...")     return MaterializeResult(value=full_table_name)
In this example,
table_1
is an asset that creates a table in Snowflake and returns a
MaterializeResult
with the
value
set to the full table name. This value can then be accessed by downstream assets that depend on
table_1
. Please note that the ability to store scalar values in
MaterializeResult
and how to access them in downstream assets is a feature that has been discussed and may be subject to change. Always refer to the latest Dagster documentation for the most up-to-date usage patterns.
12 Views