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#ask-ai
Title
# ask-ai
b

Brent Shulman

02/27/2024, 9:24 PM
How can I load the value of an asset from its IO manager from inside another op
s

Scout

02/27/2024, 9:24 PM
To load the value of an asset from its IO manager from inside another op, you can use the
load_asset_value
function provided by Dagster. This function allows you to load the materialized value of an asset outside of a Dagster run, which can be useful when you want to inspect an asset or use its value within an op. Here's a general approach based on the documentation: 1. Ensure that the asset you want to load has been materialized and that its value is managed by an IO manager. 2. Use the
load_asset_value
function to load the asset's value from its IO manager. Here is an example of how you might use
load_asset_value
within an op:
Copy code
python from dagster import op, AssetKey, build_input_context from my_project.my_module import my_io_manager  @op def my_op():     # Build the input context required by the IO manager     input_context = build_input_context(         upstream_output=AssetKey("my_asset"),         resource_config=my_io_manager.config,         # Include other necessary context parameters     )          # Use the IO manager to load the asset's value     asset_value = my_io_manager.load_input(input_context)          # Now you can use the asset_value within your op     # ...
In this example,
my_io_manager
is an instance of an IO manager that knows how to load the asset's value. You would need to replace
my_project.my_module
and
my_io_manager
with the actual module and IO manager you are using. The
build_input_context
function is used to create the
InputContext
that the IO manager expects. Please note that the exact implementation details may vary depending on your specific use case and the configuration of your assets and IO managers. If you need further assistance with a specific scenario, please provide more details about your assets and IO managers, and I can offer more targeted guidance.
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